[ARCHIVED THREAD] - Keltec has lost their mind: PR57 5,7 front lock breech top stripper clip feed defensive pistol (Page 5 of 9)
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Quoted: Just buy a second one and carry both, looks like they'll be cheap enough. Quoted: Quoted: Quoted: Everyone is going to be talking about the stripper clip loading and fixed magazine, but I wonder why they chose to go with the odd locking mechanism? I wonder if they’re going to come out with a separate line that uses detachable magazines in the same locking mechanism? I hope they make a version with a detachable mag. The thing looks cool enough, small enough and light enough to make me want one. I think the odd locking mechanism is desirable to reduce bore axis, and the lack of barrel tilting might lead to improved feeding with a long, slender round like the 5.7 (I'm speculating there). JMB invented the rotating-barrel lockup, and it's a really cool idea. I think S&W 5.7-whatever uses a rotating barrel, but I think it's gas-operated, not recoil-operated. At least, that's what I read. Just buy a second one and carry both, looks like they'll be cheap enough. LOL I was going to buy 2 Ruger LCPs until I heard of the S&W Bodyguard 2.0, because why not? They're cheap enough. If like to have two BG2.0s, but it's harder to justify with a $420 pistol. |
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Quoted: I really don't understand the fixed mag idea. I don't see how a serious defensive pistol is better with that than a detachable magazine. What if the gun jams and I need to clear it? What if I want to rapidly reload? What if I want to carry extra ammo and not have loose stripper clip things that the rounds are gonna fall out of that are gonna require some weird new mag pouch? What if I want to unload the weapon in a quick and easy way? What if there are issues with the internal magazine that if it were removeable could be fixed by just swapping that mag out? A lightweight 5.7 with a different type of action is vey cool, and viable for self defense. Going out of your way to make it less viable seems dumb, and a standard kel tec move. It is pretty sweet that Kellgren is making a successful life and business out of doing whatever he wants, and I don't think he can be faulted for that. But as a customer it's really annoying watching the way Kel Tec goes about being a gun manufacturer. For the most part it doesn't even really feel like they innovate because their products that should be trendsetting are simply overlooked since they won't take them out of the prototype phase. When the P365 came out if was all the range and game changer and blah blah blah. If someone brought up the fact that keltec built a similiar gun with actually better capacity 20 years before it was written off because that gun sucked, and the p365 shoots well, which is very true. A lot of the trends these days - micro compact pistols, lightweight folding ARs, bufferless ARs, 5.56 and .308 bullpups are markets that kel tec should be a huge player in. But instead of polishing their designs or improving on them, they just move on to tooling up for some other new weird beta project that will never be refined and seems as though kel tec has gone out of their way to make weird and less usable. Kel tec P11, came out it 1995. Imagine if sometime since then they had revamped the ergos, added a slightly longer slide and barrel for a bit more mass and better recoil and improved the trigger, sights, and added an optics cut. it would THE micro compact. And years before anyone else. Instead they scrapped the design, and rebuilt from scratch a different and terrible gun in the P15. In the early 2000s kel tec came out with the SU16 and PLR16. Lightweight bufferless ARs. One as a folding rifle and one as a pistol. Super sick. And honestly just giving them a freaking rail probably could have done wonders to dominate the market where we now see FM15s, Jakls, BRN-180s etc. people are paying up to $1000 for a SCR lower and bcg because the SU16 can't get a stock that isn't a clamshell in 2009 they come out with a decent 308 bullpup - the RFB. In 15 years they couldn't manage to refine it or figure out how to chamber it in a different caliber? Same with RDB (which I have and really like) The bullpup market could belong to the RDB if they just slightly improved the design. And I have to imagine it would be easier to rechamber a barrel than design and tool up for a whole new gun. But no, instead we get what looks like a pretty cool 5.7 pistol that nobody is gonna buy because Kellgren thinks stripper clips are innovative I think it boils down to the fact that George designs things for George, and you either like what he likes, or you don't. I fully agree on basically every point you make, and you're absolutely right. The very reason why Ruger and S&W steal Kel-Tec designs is because they never really make it out of beta, but the core concepts are solid. KT is stuck on specific manufacturing techniques and design methodologies as a result, with a focus on economical production at the cost of refinement. The plus side is, it gives their products a unique and off-kilter vibe that many people enjoy. The downside is, the products are never truly refined into a more mature design...and historically KT just moves on to the next product. The S2K has gone through legitimate refinement, but that's damn near the only product they've ever released that's had ongoing improvement, and even then it's been almost a decade between generational upgrades. KT has the resources to design and engineer and beta test more complex levels of refinement. It's not George's style, plain and simple. Much like Glock, the company product line has developed based on the tastes of the single man who started it, and while a million fans want a Glock carbine, Gaston simply didn't give a shit. George likes making lots of cool crazy things, not making a single design into absolute perfection. Years back I got to see their engineering / prototyping office, and it was downright madness. Like the island of misfit gun concepts. Things no one else would ever think of, prototyped up just to see what it was like. That's just George's way. FWIW, the muzzle flip on this pistol looks to be atrocious due to the light weight. 5.7 isn't know for recoil, but I suspect reviewers are going to complain about the snappiness of it. |
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Quoted: https://media.keltecweapons.com/wp-content/uploads/2025/01/KEL-PR57-RH-featured-medium.jpg Pros: 1) Detachable magazine bans - poof! 2) Loaded magazine bans for unlicensed OCers - looking at you, Portland - poof! 3) 10 round magazine bans easily complied with by installing a spacer, blocking floorplate, or rivet 4) Lightest 5.7 pistol on the market by far 5) Smallest 5.7 pistol on the market by far 6) 4.5 lb trigger pull 7) Dust cover Picatinny rail 8) Slide optics mount 9) $399 MSRP 10) Just 3 controls - slide lock, trigger, and the slide itself Cons: 1) Non-detachable magazine 2) No stated 10 round compliance mechanism from the factory 3) No external safeties - no manual safety, no trigger dingus 4) Not available at dealers yet 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS I’d add that it probably can’t be suppressed to the cons. I don’t think the added weight of a suppressor would allow proper barrel rotation. There’s not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it’d be interesting to try to make it work. |
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Quoted: I’d add that it probably can’t be suppressed to the cons. I don’t think the added weight of a suppressor would allow proper barrel rotation. There’s not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it’d be interesting to try to make it work. Quoted: Quoted: https://media.keltecweapons.com/wp-content/uploads/2025/01/KEL-PR57-RH-featured-medium.jpg Pros: 1) Detachable magazine bans - poof! 2) Loaded magazine bans for unlicensed OCers - looking at you, Portland - poof! 3) 10 round magazine bans easily complied with by installing a spacer, blocking floorplate, or rivet 4) Lightest 5.7 pistol on the market by far 5) Smallest 5.7 pistol on the market by far 6) 4.5 lb trigger pull 7) Dust cover Picatinny rail 8) Slide optics mount 9) $399 MSRP 10) Just 3 controls - slide lock, trigger, and the slide itself Cons: 1) Non-detachable magazine 2) No stated 10 round compliance mechanism from the factory 3) No external safeties - no manual safety, no trigger dingus 4) Not available at dealers yet 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS I’d add that it probably can’t be suppressed to the cons. I don’t think the added weight of a suppressor would allow proper barrel rotation. There’s not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it’d be interesting to try to make it work. A conventional piston won't work, granted. An adapter mounted on the dustcover would allow fixed suppressors, which are typical for 5.7x28mm. I'm very intrigued. I've been selling the 5.7 SUB2000, and it's been going out the door. I'm not sure we have any records of lawful civilian defensive shootings in which there was an actual reload - and with 20 rounds on tap, not likely necessary. I'm concerned about the lack of any external safeties and the barrel length - I'd like to see some gel tests. |
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Quoted: I’d add that it probably can’t be suppressed to the cons. I don’t think the added weight of a suppressor would allow proper barrel rotation. There’s not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it’d be interesting to try to make it work. The amount of force required to turn a can of x mass y degrees is significantly smaller than the amount of force required to tilt the same can z degrees up. This can be intuited simply from the different lengths of the effective lever arm. The rotating can's lever arm is only the length of the radius of the can. The tilt barrel is the pivot point of the barrel to the end of the can. So practically speaking, something like .625" vs 8-9". Add to that, there seems to be a number of 4-5oz .22 cans that are rated for 5.7 and I don't think you'll need any kind of booster at all. |
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Quoted: That was my thought as well. Its actually a gun that would be very hard to ban. Not at all. They'll just introduce a ban on any pistol capable of accepting, cycling or storing more than (insert number here) rounds internally. Done. And it's why we lose. We should be crafting laws to prosecute the authors of NEW unconstitutional laws, not reacting to the bad legislation they've already forced through by trying to build a subpar loading mechanism that circumvents the law. If don't stop the creation of new bad laws, we enable the "throw a ton of shit against the wall and see what sticks" cycle we go through over and over. |
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Quoted: I'd add that it probably can't be suppressed to the cons. I don't think the added weight of a suppressor would allow proper barrel rotation. There's not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it'd be interesting to try to make it work. Quoted: Quoted: https://media.keltecweapons.com/wp-content/uploads/2025/01/KEL-PR57-RH-featured-medium.jpg Pros: 1) Detachable magazine bans - poof! 2) Loaded magazine bans for unlicensed OCers - looking at you, Portland - poof! 3) 10 round magazine bans easily complied with by installing a spacer, blocking floorplate, or rivet 4) Lightest 5.7 pistol on the market by far 5) Smallest 5.7 pistol on the market by far 6) 4.5 lb trigger pull 7) Dust cover Picatinny rail 8) Slide optics mount 9) $399 MSRP 10) Just 3 controls - slide lock, trigger, and the slide itself Cons: 1) Non-detachable magazine 2) No stated 10 round compliance mechanism from the factory 3) No external safeties - no manual safety, no trigger dingus 4) Not available at dealers yet 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS I'd add that it probably can't be suppressed to the cons. I don't think the added weight of a suppressor would allow proper barrel rotation. There's not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it'd be interesting to try to make it work. But given the focus on cost-cutting and weight-savings, suppressibility probably isn't a priority for KT This would be an interesting gun to carry in a shoulder rig, where the size is less important than the weight, as a companion to a 5.7mm PDW like a P90 or PSA X5.7. |
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Quoted: Not at all. They'll just introduce a ban on any pistol capable of accepting, cycling or storing more than (insert number here) rounds internally. Done. And it's why we lose. We should be crafting laws to prosecute the authors of NEW unconstitutional laws, not reacting to the bad legislation they've already forced through by trying to build a subpar loading mechanism that circumvents the law. If don't stop the creation of new bad laws, we enable the "throw a ton of shit against the wall and see what sticks" cycle we go through over and over. While I agree in principle, getting any politician to support a law that might hold them accountable for anything seems unlikely. |
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Quoted: Not at all. They'll just introduce a ban on any pistol capable of accepting, cycling or storing more than (insert number here) rounds internally. Done. And it's why we lose. We should be crafting laws to prosecute the authors of NEW unconstitutional laws, not reacting to the bad legislation they've already forced through by trying to build a subpar loading mechanism that circumvents the law. If don't stop the creation of new bad laws, we enable the "throw a ton of shit against the wall and see what sticks" cycle we go through over and over. Quoted: Quoted: That was my thought as well. Its actually a gun that would be very hard to ban. Not at all. They'll just introduce a ban on any pistol capable of accepting, cycling or storing more than (insert number here) rounds internally. Done. And it's why we lose. We should be crafting laws to prosecute the authors of NEW unconstitutional laws, not reacting to the bad legislation they've already forced through by trying to build a subpar loading mechanism that circumvents the law. If don't stop the creation of new bad laws, we enable the "throw a ton of shit against the wall and see what sticks" cycle we go through over and over. That is something you can work on. Kel-Tec works on the mechanical side of things. Don't shit on Kel-Tec for cleverly working within the law. Every manufacturer has to produce compliant guns - rifles w/ 16" barrels, handguns without shoulder stocks, etc. |
![]() Say Hello to PR57 |
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ok, I think I get what they are thinking here. It's ultra-light, has few controls, is compact and thin while still having a full grip, and has basically zero recoil while being acceptable in lethality. Internal mag means it's smaller, cheaper, and has less to lose or worry about and 20+1 means that you don't really need extra mags. It's aimed at people who want to carry but don't want to think about it. Amateur shooters, Women, etc. I'd still prefer a manual safety and a threaded barrel or shroud so a can can be used, but for this market segment I understand why they don't bother. |
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Quoted: https://media.keltecweapons.com/wp-content/uploads/2025/01/KEL-PR57-RH-featured-medium.jpg Pros: 1) Detachable magazine bans - poof! 2) Loaded magazine bans for unlicensed OCers - looking at you, Portland - poof! 3) 10-15 round magazine bans easily complied with by installing a spacer, blocking floorplate, or rivet 4) Lightest 5.7 pistol on the market by far 5) Smallest 5.7 pistol on the market by far 6) 4.5 lb trigger pull 7) Dust cover Picatinny rail 8) Slide optics mount 9) $399 MSRP 10) Just 3 controls - slide lock, trigger, and the slide itself Cons: 1) Non-detachable magazine 2) No stated 10 round compliance mechanism from the factory 3) No external safeties - no manual safety, no trigger dingus 4) Not available at dealers yet 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS I'll probably get one but I like weird shit like this and never had anything in 5.7 cal kind of exciting. |
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Quoted: ok, I think I get what they are thinking here. It's ultra-light, has few controls, is compact and thin while still having a full grip, and has basically zero recoil while being acceptable in lethality. Internal mag means it's smaller, cheaper, and has less to lose or worry about and 20+1 means that you don't really need extra mags. It's aimed at people who want to carry but don't want to think about it. Amateur shooters, Women, etc. I'd still prefer a manual safety and a threaded barrel or shroud so a can can be used, but for this market segment I understand why they don't bother. It’s going to be loud as fuck. |
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Quoted: It's going to be loud as fuck. Quoted: Quoted: ok, I think I get what they are thinking here. It's ultra-light, has few controls, is compact and thin while still having a full grip, and has basically zero recoil while being acceptable in lethality. Internal mag means it's smaller, cheaper, and has less to lose or worry about and 20+1 means that you don't really need extra mags. It's aimed at people who want to carry but don't want to think about it. Amateur shooters, Women, etc. I'd still prefer a manual safety and a threaded barrel or shroud so a can can be used, but for this market segment I understand why they don't bother. It's going to be loud as fuck. |
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5.7x28 is a non-starter. The ammo is hard to find, quite expensive, and exceptionally difficult to reload. I bought a PS90 in 2020. I ended up selling it before ever shooting it because the ammo was such a shitstorm. The ammo situation may be better in 2025 than it was in 2020, but that cartridge is dead to me. |
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Quoted: I really don't understand the fixed mag idea. I don't see how a serious defensive pistol is better with that than a detachable magazine. What if the gun jams and I need to clear it? What if I want to rapidly reload? What if I want to carry extra ammo and not have loose stripper clip things that the rounds are gonna fall out of that are gonna require some weird new mag pouch? What if I want to unload the weapon in a quick and easy way? What if there are issues with the internal magazine that if it were removeable could be fixed by just swapping that mag out? A lightweight 5.7 with a different type of action is vey cool, and viable for self defense. Going out of your way to make it less viable seems dumb, and a standard kel tec move. It is pretty sweet that Kellgren is making a successful life and business out of doing whatever he wants, and I don't think he can be faulted for that. But as a customer it's really annoying watching the way Kel Tec goes about being a gun manufacturer. For the most part it doesn't even really feel like they innovate because their products that should be trendsetting are simply overlooked since they won't take them out of the prototype phase. When the P365 came out if was all the range and game changer and blah blah blah. If someone brought up the fact that keltec built a similiar gun with actually better capacity 20 years before it was written off because that gun sucked, and the p365 shoots well, which is very true. A lot of the trends these days - micro compact pistols, lightweight folding ARs, bufferless ARs, 5.56 and .308 bullpups are markets that kel tec should be a huge player in. But instead of polishing their designs or improving on them, they just move on to tooling up for some other new weird beta project that will never be refined and seems as though kel tec has gone out of their way to make weird and less usable. Kel tec P11, came out it 1995. Imagine if sometime since then they had revamped the ergos, added a slightly longer slide and barrel for a bit more mass and better recoil and improved the trigger, sights, and added an optics cut. it would THE micro compact. And years before anyone else. Instead they scrapped the design, and rebuilt from scratch a different and terrible gun in the P15. In the early 2000s kel tec came out with the SU16 and PLR16. Lightweight bufferless ARs. One as a folding rifle and one as a pistol. Super sick. And honestly just giving them a freaking rail probably could have done wonders to dominate the market where we now see FM15s, Jakls, BRN-180s etc. people are paying up to $1000 for a SCR lower and bcg because the SU16 can't get a stock that isn't a clamshell in 2009 they come out with a decent 308 bullpup - the RFB. In 15 years they couldn't manage to refine it or figure out how to chamber it in a different caliber? Same with RDB (which I have and really like) The bullpup market could belong to the RDB if they just slightly improved the design. And I have to imagine it would be easier to rechamber a barrel than design and tool up for a whole new gun. But no, instead we get what looks like a pretty cool 5.7 pistol that nobody is gonna buy because Kellgren thinks stripper clips are innovative I have to say I agree. I always hope for Ruger or S&W to announce a very familiar looking bullpup. I really think a lot of their designs have potential to even be better if they’d just iterate on them a bit more. The RFB was a neat product designed when surplus FAL mags were cheap and ubiquitous. Now they are rare and expensive. An RFB that takes that basic design and enhances it for the now-somewhat-standardized AR .308 mags would be amazing. Clean up the ergos a bit, tone down the Home Depot screw-aisle look. The only competitor it has is the Tavor 7 and they could likely beat it on accuracy and cost if they tried. There’s a lot right with the RDB and the system is extremely accurate and highly tunable. The mag catch sucks balls though. The foreend is pretty dated. The RDB Defender isn’t quite what I had in mind as an update for it; the adjustable stock is pretty dumb. Everyone always harps on how George never takes on debt to finance a new project which explains their relative slowness on everything. At the same time, instead of crapping out a half-ass idea, he should taking some of their money and reinvesting in product updates. |
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Quoted: 5.7x28 is a non-starter. The ammo is hard to find, quite expensive, and exceptionally difficult to reload. I bought a PS90 in 2020. I ended up selling it before ever shooting it because the ammo was such a shitstorm. The ammo situation may be better in 2025 than it was in 2020, but that cartridge is dead to me. You can but standard plinking ammo for $20-30/50 all day. Sure not 9mm cheap, but it's not "hard to find" - currently... |
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Quoted: 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS |
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The ammo is hard to find, quite expensive Ammo is getting a *little* easier to find...Midway has some Fiocchi 40gr for $0.50/rd. Still expensive, but should get cheaper in the next couple years. |
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Quoted: What feature get it in the ban roster? 20 rounds? Seems if there was an ammo capacity issue, a pinned model (like mags in Trudeauland) could make it pass. I remember video of these "tactical" gun enthusiasts in Canada. Fully Larped out, shooting SKS rifles. Their snap in 30 round mags were pinned to only load 5 rounds. I think Fidel Jr has now banned even those. I'm no expert but to get on roster it would need a manual safety, loaded chamber indicator,drop test. I'm sure theres more to it. |
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Quoted: I really don't understand the fixed mag idea. I don't see how a serious defensive pistol is better with that than a detachable magazine. What if the gun jams and I need to clear it? What if I want to rapidly reload? What if I want to carry extra ammo and not have loose stripper clip things that the rounds are gonna fall out of that are gonna require some weird new mag pouch? What if I want to unload the weapon in a quick and easy way? What if there are issues with the internal magazine that if it were removeable could be fixed by just swapping that mag out? A lightweight 5.7 with a different type of action is vey cool, and viable for self defense. Going out of your way to make it less viable seems dumb, and a standard kel tec move. It is pretty sweet that Kellgren is making a successful life and business out of doing whatever he wants, and I don't think he can be faulted for that. But as a customer it's really annoying watching the way Kel Tec goes about being a gun manufacturer. For the most part it doesn't even really feel like they innovate because their products that should be trendsetting are simply overlooked since they won't take them out of the prototype phase. When the P365 came out if was all the range and game changer and blah blah blah. If someone brought up the fact that keltec built a similiar gun with actually better capacity 20 years before it was written off because that gun sucked, and the p365 shoots well, which is very true. A lot of the trends these days - micro compact pistols, lightweight folding ARs, bufferless ARs, 5.56 and .308 bullpups are markets that kel tec should be a huge player in. But instead of polishing their designs or improving on them, they just move on to tooling up for some other new weird beta project that will never be refined and seems as though kel tec has gone out of their way to make weird and less usable. Kel tec P11, came out it 1995. Imagine if sometime since then they had revamped the ergos, added a slightly longer slide and barrel for a bit more mass and better recoil and improved the trigger, sights, and added an optics cut. it would THE micro compact. And years before anyone else. Instead they scrapped the design, and rebuilt from scratch a different and terrible gun in the P15. In the early 2000s kel tec came out with the SU16 and PLR16. Lightweight bufferless ARs. One as a folding rifle and one as a pistol. Super sick. And honestly just giving them a freaking rail probably could have done wonders to dominate the market where we now see FM15s, Jakls, BRN-180s etc. people are paying up to $1000 for a SCR lower and bcg because the SU16 can't get a stock that isn't a clamshell in 2009 they come out with a decent 308 bullpup - the RFB. In 15 years they couldn't manage to refine it or figure out how to chamber it in a different caliber? Same with RDB (which I have and really like) The bullpup market could belong to the RDB if they just slightly improved the design. And I have to imagine it would be easier to rechamber a barrel than design and tool up for a whole new gun. But no, instead we get what looks like a pretty cool 5.7 pistol that nobody is gonna buy because Kellgren thinks stripper clips are innovative @cj3waker Attached File |
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Quoted: it's .06" shorter than other 5.7 standard pistols. I just reviewed the Rock Compact with a 4.3" barrel. It only lost 30-70 fps on some loads. That still puts it 300-400 fps FASTer than almost all .22 magnums in handguns lol..... Quoted: Quoted: 5) 5.7x28mm out of a 4.64" barrel is going to be closer to .22 WMR than ever - @PursuitSS it's .06" shorter than other 5.7 standard pistols. I just reviewed the Rock Compact with a 4.3" barrel. It only lost 30-70 fps on some loads. That still puts it 300-400 fps FASTer than almost all .22 magnums in handguns lol..... Wow. Didn't realize PSA already had their Compact out. I will revise. |
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Quoted: I’d add that it probably can’t be suppressed to the cons. I don’t think the added weight of a suppressor would allow proper barrel rotation. There’s not a really feasible way to boost the suppressor like on a normal tilting barrel design. Maybe the bullet rotation on the specially designed baffles would assist with rotating the barrel and unlocking the action. Idk it’d be interesting to try to make it work. I literally searched out this thread because I was wondering if anyone else realized this lol. It *probably* can be suppressed like the B&T TP9, but will require a low pressure/flow through can to work without tearing the gun apart. Maybe it would work with the hux flow 22. |
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Quoted: The amount of force required to turn a can of x mass y degrees is significantly smaller than the amount of force required to tilt the same can z degrees up. This can be intuited simply from the different lengths of the effective lever arm. The rotating can's lever arm is only the length of the radius of the can. The tilt barrel is the pivot point of the barrel to the end of the can. So practically speaking, something like .625" vs 8-9". Add to that, there seems to be a number of 4-5oz .22 cans that are rated for 5.7 and I don't think you'll need any kind of booster at all. The bigger issue I believe is the backpressure from the can is going to open and unlock the breach significantly faster and send the bolt flying back into that good quality plastic that keltec is known for. |

