Collimatrix Posted August 4, 2015 Report Share Posted August 4, 2015 Cutting down manually-operated weapons generally only loses you ballistic performance (OK, and sight radius and capacity if you have a tube mag). Cutting down the barrel on self-loading weapons is fraught with difficulty. The self-loading action is "tuned" to a specific barrel length, and making it shorter (or longer) tends to muck up the balance. For a gas-operated weapon, cutting down the barrel means that need to relocate and/or re-size the gas port. Since the garand has the gas port basically at the very end of the barrel, you need to do both. Generally speaking, shortened versions of gas-operated rifles are less reliable. The M4, for instance, breaks bolts at a measurably higher rate than the M16: On the M4, the gas is tapped much closer to the firing chamber than on the M16. This means that the actuation of the bolt carrier by the gas happens sooner after firing than in the M16. This makes extraction of the spent case harder, because it hasn't had as much time to contract from its expanded state and peel itself off the firing chamber walls. Also, because the gas being tapped is at a higher pressure and temperature (because it hasn't expanded down the bore as much), the action of the moving parts is more abrupt and violent. M4s have about a 25% higher rate of fire than M16s because of these effects. M4s are still very reliable when looked after, but they are measurably breakier and less reliable than M16s. On recoil-operated weapons cutting down the barrel also throws things out of whack, because the recoil of the barrel is what actuates the action. Since you have more or less the same amount of recoil as you do with the longer barrel, but less mass, cut-down versions of recoil-operated weapons tend to cycle faster. This makes it more likely that the action will "skip a beat" now that everything is moving faster, but sometimes this is done deliberately. The M3 .50 air machine gun had a shorter barrel than the M2 it was (loosely) based on, and this is part of what drove the rate of fire up. The Germans also made a version of the MG-34 with a cut-down barrel to improve portability and increase ROF called MG-34S (not mass produced IIRC): In blowback systems the barrel length determines the duration of blowback pressure on the bolt. The pressure drops pretty fast in the bore once the bullet "uncorks" past the muzzle. On retarded blowback systems like the HK roller guns, the entire system is very sensitive to changes in the duration and magnitude of pressure, so they typically work well with a single ammunition and barrel length combination. HK was clever enough to put interchangeable Steuerstückenses, which allow the armorer to re-jigger the mechanical ratios somewhat so the gun is happy with different barrel lengths and ammo. LoooSeR 1 Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted August 4, 2015 Report Share Posted August 4, 2015 Wow, Pimp My Gun. Classy. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted August 4, 2015 Report Share Posted August 4, 2015 Working on TFB shit late, glance at clock:Huehuehuehueh... Belesarius and LoooSeR 2 Quote Link to comment Share on other sites More sharing options...
Belesarius Posted August 4, 2015 Report Share Posted August 4, 2015 Wow, Pimp My Gun. Classy. Welp, for this purpose, it worked. Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 4, 2015 Report Share Posted August 4, 2015 This bag is making me giggle. Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 4, 2015 Report Share Posted August 4, 2015 Syria Muzzle device to launch handgrenades. Collimatrix and Alex C. 2 Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 4, 2015 Report Share Posted August 4, 2015 Zabadani, Syria, SSNP members. Their emblem... and good old AKs (or clones?) Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted August 5, 2015 Report Share Posted August 5, 2015 Russian speakers, could I have a translation on this please? LoooSeR and Sturgeon 2 Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 First picture is Postnikov biography. Second picture: "One of the more exotic and complex rifles was Postnikov's avtomat APT (was immediately removed from trials). It used gas operated system, that took gas from hole in the capsule of the cartridge. However unlike the studies of Fedorov V.G. and Blagonravov A.A., who claimed that such system will require special catridge with thickened bottom, Postnikov managed to realize such system using usual 5.45mm catridge. When fired, the pressure of gases through the capsule impacted hammer, which move back, thereby unlocking the bolt." Collimatrix 1 Quote Link to comment Share on other sites More sharing options...
Belesarius Posted August 5, 2015 Report Share Posted August 5, 2015 Welp, it certainly is fugly. Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 A guy in Magpul, that named a stock "Zhukov" should find himself in Northen Siberia. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted August 5, 2015 Report Share Posted August 5, 2015 First picture is Postnikov biography. Second picture: "One of the more exotic and complex rifles was Postnikov's avtomat APT (was immediately removed from trials). It used gas operated system, that took gas from hole in the capsule of the cartridge. However unlike the studies of Fedorov V.G. and Blagonravov A.A., who claimed that such system will require special catridge with thickened bottom, Postnikov managed to realize such system using usual 5.45mm catridge. When fired, the pressure of gases through the capsule impacted hammer, which move back, thereby unlocking the bolt." Thank you for the translation. So that is the rifle with the gas bleed operating system. Interesting. What's so bad about the Zhukov stock? Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 Naming a stock after Zhukov is like naming a burger after Martin Luther King Jr. Sturgeon and Tied 2 Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted August 5, 2015 Report Share Posted August 5, 2015 ... That's brilliant! I'll call McDonald's right now! Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 ... That's brilliant! I'll call McDonald's right now! Black Falcatus are approaching your home, you have 20 seconds to run and save yourself from being removed. Quote Link to comment Share on other sites More sharing options...
Collimatrix Posted August 5, 2015 Report Share Posted August 5, 2015 They're working for the Burger King! They want to steal the brilliant idea for themselves! Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 They're working for the Burger King! They want to steal the brilliant idea for themselves! Martin Burger Luther King? Man... they almost got to your door... Burger King is secretly a communist plot to make Americans into commies. Just before USSR collapse, KGB created a plan to infiltrate US fast foods and spread Communistium through all kinds of unhealthy food that Americans consume... you got to close to this plan, it is time to remove you. Prepare for your new home - FEMA deathcamp cell. Uhh, at least you don't know that Communistium have a side effect - it can damage brains of some individuals. Those, who eat too much of fast food can show signs of merging of Democrazy and Commiestupism, while being big, fat and stupid in the first place because of eating to much food with secret chemical. Americans call them those people, who have signs of Communistium side effects as "SJW". Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 Somebody should find this Popenker guy and gently ask him to steal take one of those carabines for ...testing... yeah, testing. Belesarius 1 Quote Link to comment Share on other sites More sharing options...
Belesarius Posted August 5, 2015 Report Share Posted August 5, 2015 Somebody should find this Popenker guy and gently ask him to steal take one of those carabines for ...testing... yeah, testing. Needs more tactikewl. Quote Link to comment Share on other sites More sharing options...
D.E. Watters Posted August 5, 2015 Report Share Posted August 5, 2015 Hmm, I'm wondering if this isn't a roundabout reference to a primer setback action, like the early Garand designs and the AAI SPIW. First picture is Postnikov biography. Second picture: "One of the more exotic and complex rifles was Postnikov's avtomat APT (was immediately removed from trials). It used gas operated system, that took gas from hole in the capsule of the cartridge. However unlike the studies of Fedorov V.G. and Blagonravov A.A., who claimed that such system will require special catridge with thickened bottom, Postnikov managed to realize such system using usual 5.45mm catridge. When fired, the pressure of gases through the capsule impacted hammer, which move back, thereby unlocking the bolt." Quote Link to comment Share on other sites More sharing options...
Alex C. Posted August 5, 2015 Report Share Posted August 5, 2015 Black Falcatus are approaching your home, you have 20 seconds to run and save yourself from being removed. **loads M2HB with 100 round belt of Raufoss MK211** I mean, I would still die but at least I would inconvenience them. Quote Link to comment Share on other sites More sharing options...
LoooSeR Posted August 5, 2015 Report Share Posted August 5, 2015 I think about 2 years ago one SF guy in his blog posted a photo of one home-made RPG launcher, which they found during operation Little bit unusual bipods. Quote Link to comment Share on other sites More sharing options...
Sturgeon Posted August 5, 2015 Report Share Posted August 5, 2015 Hmm, I'm wondering if this isn't a roundabout reference to a primer setback action, like the early Garand designs and the AAI SPIW. Sounds to me like an expanding case head design. Quote Link to comment Share on other sites More sharing options...
Tied Posted August 5, 2015 Report Share Posted August 5, 2015 A guy in Magpul, that named a stock "Zhukov" should find himself in Northen Siberia. I mean, there is no reason not to? Quote Link to comment Share on other sites More sharing options...
Tied Posted August 5, 2015 Report Share Posted August 5, 2015 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.