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<\/p>\nDelayed systems include a good deal more variation than unlocked systems, though they are not as prolific as locked systems.\u00a0 Nevertheless, while fewer in number, these guns show perhaps the broadest array of unique concepts and novel ideas.\u00a0 Their strengths over unlocked systems are fairly noticeable, in that they require less mass and spring resistance to safely delay opening; a combination that usually greatly enhances both the ergonomics of handling the gun, and the realities of recoil and back gas pressure in practical shooting.\u00a0 This, of course, usually comes with much higher complexity and cost in research, development, and manufacturing.<\/p>\n
Their qualities when compared to locked systems, however, are a little less starkly different.\u00a0 There may be potential for some smoother actions without the mechanical disengagement of otherwise locked pieces occurring\u2026 but as so much else can affect this characteristic, there is likely not much difference in reality.\u00a0 Delayed systems do tend to still open at higher pressures than locked systems, and can sometimes get dirty swiftly in the process.\u00a0 However, one area they shine in is the purely academic analysis of their mechanics, as they tend to employ more intricate balances between the different forces of firing.\u00a0 And since that is what is being looking at here, the author shall get on with it.<\/p>\n
Delayed system can be broken down at their highest level into two branches that are mirrored in locked systems as well \u2013 gas delayed, and mechanically delayed.<\/p>\n
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Gas Delayed<\/u><\/strong><\/p>\n Gas delayed systems do exactly as the name would suggest, they use gas pressure to delay the opening of the action.\u00a0 This is actually one of the more (to the author\u2019s mind) clever ideas in handgun design; the goal of auto-loading designs is to wait just long enough to cycle the action so that gas pressure can drop to a safe level, and what better way to determine when that has occurred than using the gas pressure itself to keep the action closed.\u00a0 While this may be a practical upshot, the downsides are that using gas pressure makes the internals of the gun much dirtier to clean, and much hotter to handle.<\/p>\n There are two extant methods for laying out such an operating system.<\/p>\n <\/p>\n Gas Piston<\/u><\/p>\n The first, and more common, method of accomplishing this aforementioned task is with the use of a gas piston.\u00a0 Gas is tapped and vented from the barrel and channeled into a small chamber that is sealed on the opposite end by a snuggly fit piston head.\u00a0 As the pressure of firing the gun fills this chamber, the piston is pressed forward with equal force.\u00a0 The other end of the piston is attached, or otherwise impacts against, the slide.\u00a0 Since the force of firing the round is equally exerted in all directions, the pressure pushing forward against the bullet and piston head strongly resists the recoil force, and the opening of the gun is considerably slowed.\u00a0 Once the bullet leaves the barrel, the gas pressure drops rapidly in both the barrel and piston chamber, allowing the residual recoil energy to compress the piston in the chamber and cycle the action.<\/p>\n A number of guns have been designed with this operation, including the venerable HK P7, the Walther CCP, and the newly minted Laugo Alien.\u00a0 The author is accepting donations for the $5000 Alien pistol, if the reader is so inclined\u2026<\/p>\n <\/p>\n Gas Chamber<\/u><\/p>\n Another design built to take advantage of this system simply flips the gas piston concept around backwards\u2026 sort of.\u00a0 The Steyr GB (and its far lower quality Rogak rip-off) is designed around this idea.\u00a0 The nose cap of the slide includes a gas chamber that seals around a finely machined portion of the barrel, thus making the slide the chamber and the barrel the piston.\u00a0 Gas is vented from a port in the barrel directly into this chamber, thus holding the slide forward against the machined surface of the barrel.\u00a0 Once the pressure drops, the action works much the same way, except with the piston surfaces of the barrel holding fast as the slide-bound chamber reciprocates.<\/p>\n As noted, the author is aware of the Steyr GB being the only handgun to successfully use this system, as the Rogak is, by all available accounts, far to poorly fit and finished to actually achieve its design concept.<\/p>\n <\/p>\n Mechanically Delayed<\/u><\/strong><\/p>\n Mechanically delayed systems show a bit more variability than their gas delayed counterparts.\u00a0 The concept here is the same, to delay opening of the action until gas pressures have reduced to a safe level, but instead of using pneumatics these guns get their delay from what could be creatively described as forcing the recoil energy to solve puzzles.\u00a0 (pause inserted for confused looks and any wayward chuckles\u2026)<\/p>\n Unlike a locked system, there is no external force required to decouple any of the parts; all the force applied to open the action comes directly from the chamber.\u00a0 But unlike an unlocked design philosophy of resistance through sheer mass and force, a mechanically delayed system employs pieces that must interact in various ways to bleed energy out of system and thus slow the opening of the action.<\/p>\n This can actually be broken down into two further subsets.\u00a0 The less complex of these are systems that merely use additional resistance from friction, drag, etc. to enhance the innate resistance of the slide and recoil spring.\u00a0 The more complex systems use more nuanced mechanical components to disadvantage and delay the action.<\/p>\n The author could continue to attempt to generally describe this, but the concept is better understood via looking directly at some examples.<\/p>\n <\/p>\n Friction Delay<\/u><\/p>\n The simplest method for delaying the movement of various parts is by gripping them more tightly.\u00a0 This is essentially what friction delaying mechanisms do, though it is highly debatable how effectual such designs are.\u00a0 The most notable of these would be the Blish Lock employed in earlier versions of the Thompson submachine gun, wherein it was posited that the friction between brass and steel would be substantial enough to slow the action\u2026 spoiler alert, it didn\u2019t so much, and that gun handled the .45acp recoil by having a 2lb bolt.<\/p>\n In handguns, the best example of this as a specific design component that the author is aware of is in the Mannlicher 1901.\u00a0 This gun increases friction and force within itself with the hammer weight and geometry, spring weight, and by pressing components up snuggly against the bolt itself.\u00a0 (For a far more competent explanation of this, the reader is directed to the C&Rsenal video on the subject.)\u00a0 Ultimately, it is questionable how much different from an unlocked design this really is, and it could arguably be considered a straight blow back gun, as the Thompson is remembered.\u00a0 Nevertheless, the author has included it here for its apparent design intent as opposed to its realistic application.<\/p>\n <\/p>\n Chamber Ring Delay<\/u><\/p>\n If you want to delay ejection of a spent casing, why not just make the casing harder to eject?\u00a0 One method for carrying out this simple idea, is to cut an annular ring into the chamber itself.\u00a0 Upon firing, the gas pressure pushing the bullet down the barrel also presses outward as chamber pressure, thus swelling the brass case into the shallowly recessed ring.\u00a0 The resultant minor bulge in the case itself makes it harder to yank free, thus slowing the system to a safe speed.\u00a0 Once again, the question of how much of the delay is conceptual vs. real is debatable, especially since the only examples the author is aware of are chambered in calibers otherwise conducive to direct blow back operation anyway.<\/p>\n This comparatively crude concept has actually been deployed in a few handguns.\u00a0 The Fritz Mann pistol was a 1920s example of this system in a diminutive vest pocket pistol size.\u00a0 For a more modern take on the same idea, the reader is referred to the currently produced Seecamp line of tiny mouse guns.<\/p>\n <\/p>\n Grip Delay<\/u><\/p>\n Rounding out the collection of \u201cenhanced resistance\u201d designs is the unique design concept behind the Thomas pistol manufactured briefly in the 1970s by AJ Ordnance.\u00a0 This quite dense but fairly compact pistol utilizes the shooters own grip strength to provide delaying force against the recoil of a .45acp round.\u00a0 I backstrap in the grip is depressed by the shooter\u2019s palm, thus rotating two angled lugs upward and into contact with corresponding angled cutouts in the slide.\u00a0 When fired the recoil energy presses the gun further into the shooters grip even as the slide begins to cam the lugs down.\u00a0 As the lugs are pressed back down, the grip backstrap is driven further back into the shooter\u2019s palm.\u00a0 Once cleared, the slide continues to operate as expected.<\/p>\n One might surmise that this very unusual (and unsuccessful) pistol would have been the only attempt to use the shooter\u2019s own hand to specifically contain the recoil pressure of a handgun; however, as it turns out the very first patented semi-automatic pistol ever used a related design.\u00a0 The Salvator-Dormus pistol was patented in 1891, and while it appears to be a simple blow back mechanism, there is in fact a wedge connected to the trigger that engages with the bolt, thus requiring the force of the shooter\u2019s trigger pull to be rebuffed as the bolt recoils backwards.<\/p>\n Only about 50 Salvator-Dormus pistols were made, and while the Thomas is still a rarity due to poor sales, they are far more obtainable\u2026 to the author\u2019s good fortune.\u00a0 Whilst neither the trigger nor the recoil of the Thomas pistol are in any way close to being good, they are not as abjectly terrible as some other more successful designs (see the CZ-52).\u00a0 It is likely that its commercial failure is also largely contributable to the awkward handling characteristics incumbent in a design where merely holding the grip effectively blocks the manual cycling of the slide.<\/p>\n <\/p>\n Barrel Rotation Delay<\/u><\/p>\n Moving into the category of \u201cmechanically disadvantaged\u201d systems, first up is the rotating barrel delay of the Savage 1907\/1917 pistol family, and the later MAB P-15.\u00a0 When at rest, the gun\u2019s barrel has a small camming surface on the top that engages into a cam track in the slide.\u00a0 When fired the slide must rotate the barrel slightly in order to clear this cam and open.\u00a0 (It is key to note that this surface is angled so it can be pressed out of the way by chamber pressure, as opposed to being locked into place and requiring an outside force to decouple as in rotating barrel locked systems.)\u00a0 This alone would provide next to no delay on the system, but the direction of camming delay is cleverly opposed to the rotational force of the barrel.\u00a0 At first glance, the Savage 1907\u2019s rifling angles in the same direction as the barrel rotates \u2013 clockwise when viewed from the breech.\u00a0 But since the bullet is resistant to being spun, the force it exerts on the barrel is actually counterclockwise as it tries to instead spin the barrel around itself.\u00a0 This counterclockwise force on the barrel opposes the necessary clockwise rotation needed to open the action.\u00a0 Of course, the counter rotational force isn\u2019t nearly as strong as the recoil force, and it quickly dissipates as the bullet begins to take on spin, so the exact amount of delay this provides is dubious.\u00a0 In his shooting of this gun, the author has noted a not insignificant amount of smoke and general grime issuing from the breech end of the barrel, suggesting that the opening of the gun is likely not delayed by much\u2026 once again, donations for the high speed 4k video equipment necessary for split second analysis would be considered.<\/p>\n Several Savages using this system were built in .45acp for U.S. pistol trials, and the later French MAB P-15 pistol uses a similar system scaled up to 9mm.\u00a0 As the author\u2019s Savage 1907 is chambered in .32acp, it was difficult to sense the amount of delay the system provides\u2026 so to sate his curiosity, the author obtained a P-15.\u00a0 The mechanism in this more traditional looking French pistol is virtually identical to the Savage, just chambered in 9mm.\u00a0 However, it is immediately apparent from handling the P-15 that the amount of delay generated in the system is certainly less than with other delayed designs.\u00a0 The P-15 is dense with a very thick and heavy slide and an extremely stiff recoil spring.\u00a0 These characteristics make it clear that in addition to the rotating barrel, the gun still must employ several tricks from simple blow back operation to keep itself and the shooter safe\u2026 a bit of a disappointing conclusion, but it still shoots nicely regardless.<\/p>\n <\/p>\n Roller Delay<\/u><\/p>\n Without a doubt, the most famous and successful of delayed designs is the roller delay.\u00a0 Tracing its design history back to at least the 1940s, an entire lineage of well regarded arms have employed this system.\u00a0 That said, of this litany, only a few were actually developed in a traditional handgun format.\u00a0 Most notably amongst this small brotherhood, is the HK P9 (and it\u2019s marginally shorter variant, the P9S).<\/p>\n So how does it work?\u00a0 Well, the slide design in the P9 is fairly similar and analogous to the bolt\/carrier group in an MP5 or other more common roller delayed firearms.\u00a0 The slide has an attached \u201clocking piece\u201d, which is confusingly named since the gun isn\u2019t locked, but oh well.\u00a0 Over the locking piece fits a floating bolt head containing the two rollers.\u00a0 When at rest, the slide is pressed forward by the recoil spring, which in turn presses forward the affixed locking piece with its two angled surfaces.\u00a0 These press the bolt head into battery and at the same time, wedge the two rollers into corresponding grooves in extensions of the barrel (analogous to a trunnion).<\/p>\n When fired, the force of the recoil presses back on the bolt face, but the rollers hold the barrel and bolt head together.\u00a0 If the gun were locked, this would be unsuccessful at opening the breech until some other force entered the party, but instead the rearward force on the bolt begins to roll the rollers inward.\u00a0 This is allowed since the locking piece has angled surfaces that can be \u201cpinched\u201d rearward as the rollers act against it; however, since the locking piece is held forward by the mass of the slide and recoil spring, the rollers must first overcome all of that force to move the locking piece out of the way so the breech can open.\u00a0 Essentially the system is cleverly designed in a way that forces the recoil energy from within the chamber to move the slide rearward at an initially faster rate than the bolt head itself, thus delaying the cycling of the gun.<\/p>\n Got it?\u00a0 If you answered no, the author would refer you to some videos from one Mr. McCollum on his YouTube channel entitled \u201cForgotten Weapons\u201d.\u00a0 Additionally, the reader can view the animation below on repeat until it makes more sense.<\/p>\n <\/p>\n Flapper Delay<\/u><\/p>\n Flapper locking is the predecessor to roller-based systems, and works similarly, just with wing-like flappers in place of rollers.\u00a0 But flapper locking in handguns appears to have never gotten out of the prototype phase for handgun designs, and this section isn\u2019t for locking systems anyway.\u00a0 That said there is at least one gun that does use a flapper to provide an at least minor delay to the bolt.\u00a0 The Roth Steyr\/Krnka 1907.<\/p>\n This Roth pistol is in fact a rotating bolt, locked breech system, but it has an additional delaying mechanism that the author shall briefly discuss here as it fits nowhere else.\u00a0 On the side of the bolt, there is mounted a small lever, which when in battery, extends out of the bolt and out of the way of the firing pin, and into a recess in the frame.\u00a0 When pressed inwards by the frame under recoil, it accomplishes its primary function of blocking the firing pin and providing an out of battery safety.\u00a0 Nevertheless, this action does bleed energy out of the recoil force in order to squeeze the flapper inwards as the bolt travels rearward.\u00a0 How much energy, the author cannot say until the dreamt-of-someday that he can shoot one in a controlled setting.\u00a0 Regardless, this does make the Roth Krnka\/Steyr 1907 an additionally unique gun in its mix of systems.<\/p>\n <\/p>\n Wing Delay<\/u><\/p>\n In the year of our Lord 2017, SliencerCo. brought to market the Maxim 9 integrally suppressed pistol.\u00a0 Whilst the main spectacle of the pistol is the suppression, the more interesting concept for the purposes of this article is the proprietary \u201cWing Delay\u201d operating system.<\/p>\n (The author hereby apologizes if any of this information is incorrect, as there are exactly 1 videos that he has been able to find that show the guts of this gun briefly.\u00a0 Until he can update this with photos of an actual gun in hand, this is the best he can surmise.)<\/p>\n Whilst unique, this design bears a strong similarity to roller delayed designs.\u00a0 The barrel is fixed in place (as is necessary for the integral suppressor to work) and only a very small slide on the back of the gun reciprocates when firing \u2013 oddly reminiscent of some nerf guns actually.\u00a0 The slide includes two recoil springs that are locked into the frame and draw it forward and closed.\u00a0 Within the slide is a spring loaded breechblock that has a forward jutting hinged \u201cwing\u201d on the left side.\u00a0 When closed the slide is pulled forward and the breechblock is compressed back by the breech end of the barrel.\u00a0 As this happens, the wing is hinged inward and its rounded (somewhat roller shaped) tip engages with a corresponding cutout in the barrel.\u00a0 This holds the entire action closed until the slide is drawn back (which lets the breechblock forward and hinges the wing out of the way as it opens) or until the gun is fired.<\/p>\n Once fired, the recoil energy of the round presses back against the breechblock and slide.\u00a0 The rounded end of the wing begins to be dragged against the cutout barrel, tilting the wing outwards and delaying the breechblock from opening even as the slide begins moving back.\u00a0 The ambiguity that remains in the author\u2019s mind is whether the tilting of the wing is responsible for forcing the slide back at a faster rate than the breechblock (like in a roller delayed system), or if the wing merely holds the breechblock closed to the barrel until enough inertia has transferred into the slide for it to move and let the wing loose (much more akin to an inertia locked system).\u00a0 The author leans toward the first explanation, however, based on the manufacturer identifying the system as delayed, and the 1 aforementioned video in which the rounded tip of the wing shows obvious friction wear.<\/p>\n An example will be required for further testing on this point\u2026<\/p>\n <\/p>\n Camming Lever Delay<\/u><\/p>\n Camming levers have been used in handguns as early as the Glisenti 1910 pistol (see the C&Rsenal video on this design in comparison to the following).\u00a0 As of 2020 there are two guns on the market utilizing this mechanism; the FN Five-seveN, and the Ruger 57.\u00a0 Both fire the 5.7x28mm cartridge, and employ a similar system which uses a camming lever under the barrel.\u00a0 The author owns the Ruger 57, which will be used as an example here.<\/p>\n When at rest the slide presses forward on the barrel, which (unlike other delayed systems) moves forward and into battery as well.\u00a0 As the barrel moves forward, it presses against a surface on the camming lever whose fulcrum point is affixed to the frame.\u00a0 The lever then cams up and forward, extending two wings into corresponding cutouts in the slide.<\/p>\n When fired the recoil energy presses rearward on the breech face, but to open, the slide must first swing the wings of the camming lever down and out of the way.\u00a0 To do this, the lever must rotate backwards, pushing barrel back a short distance with it.\u00a0 This adds more inertial mass to the recoil stroke.\u00a0 However, forward drag from the bullet travelling down the barrel, and forward gas pressure against the shoulder of the necked casing, are actively pulling the barrel forward against the camming lever.\u00a0 This sets up a sort of tug-of-war wherein the barrel is attempting to rotate the lever forward while the slide is attempting to rotate it rearward.\u00a0 The rearward recoil force is the stronger of the two, and as the bullet leaves the barrel and the pressure drops, it is only slowed in its efforts to cycle the action.<\/p>\n Just as some of the earlier systems described are arguably very near to simply being unlocked, the camming lever delay system here discussed could arguably be considered locked.\u00a0 It could be argued that the lever locks the barrel and slide together, and the normal force of the frame at the fulcrum of the lever is what pivots the lever and unlocks the two pieces, thus making the gun a short recoil, locked breech system.\u00a0 On the other hand, the lever does not fully lock the barrel and slide \u2013 the slide engages the lever further out from its pivot point than the barrel, and thereby can actually move rearward faster than the barrel (if only by a minuscule amount).\u00a0 Furthermore, there is absolutely a delaying action brought to bear on the lever by the forward drag of the bullet; this occurs in locked systems too, but the use of a lever to harness this force increases its leverage and usage within the system.<\/p>\n Ultimately, these guns can and have been argued both ways, as they have features that can be categorized as either locked or delayed depending on the reader\u2019s point of view.\u00a0 The author has made the potentially contentious decision of identifying these as delayed systems, ultimately because that is how their respective manufacturers have chosen to define them\u2026 and whether that is due to physics or marketing, the system is pretty cool regardless.<\/p>\n <\/p>\n Pistol Phylogeny Part 4 \u2013 Locked (Various Designs)<\/a><\/p><\/blockquote>\n![\"\"](\"http:\/\/surplused.com\/wp-content\/uploads\/2020\/05\/PSX_20200519_170927.jpg\")
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