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Okay, I've been studying this bolt weight issue and I've concluded that my previous assumptions were wrong. It probably does need to be around 6 lbs. It might be possible to get away with a bit less, but 6 lbs. is in the right ballpark. I think the 7 lbs estimate in the one blog is overkill...

They took a gamble and it worked out. They did this relatively recently. How come nobody was selling something like the Hi-Point 30 years ago? Because improvements in technology (synthetic frames in particular) made it more practical. Also, a blowback pistol isn't all that unusual. There have...

Reportedly? The only place I could find this weight reported was in a blog where they were just basing the weight on a calculation. They didn't actually weigh it. The guy in the video said that the guess sounded reasonable, but he didn't weigh it either. Their estimate could easily be a pound or...

Because it would be inferior to the proven designs that are already available. When I said it was workable, I only meant that it could be made to work. I never said that it would be commercially viable.

Jon Snow, does the AR57 have a fluted chamber?

Actually, it would be fine to sacrifice functionality with lighter bullets. They're typically only used for long range varmint hunting, and this gun wouldn't be a good choice for that anyway. It doesn't really need to handle anything over 70 gr either, as bullets that heavy are rather...

V, thanks for the link. Very interesting. Now I'm even more convinced that this could work. Imagine how much better this could be done using modern materials.

It's not ideal, but so what? If it works OK, it doesn't matter. Not really. Sure, that would be preferable, but lots of guns won't work properly with absolutely every possible load. As with any semi-auto, you should test several and settle on the ones that work best. If you want to use extra...

Brian, interesting link. So what was wrong with it? Judging from the Wiki article, it was quite successful.

That's the beauty of the fluted chamber. It allows gas to flow around to the front of the shoulder, thereby equalizing the pressure on both sides of the shoulder. Thus, the shoulder doesn't need to be supported. The G3 has a fluted chamber and does the same thing, yet it has a good reputation...

And at that time it was true. But that was before the invention of the fluted chamber and the .223 Rem. cartridge. It's the combination of these two elements that make it viable. The fluted chamber manages the pressure and the .223 provides low enough recoil.

Actually, I just punched the numbers into a pocket calculator and found that the momentum of a 124 gr bullet at 1300 fps and a 55 gr bullet at 3000 fps is almost the same! I guess the recoil velocity is determined partially by both.

My post above was for holdencm9. I posted it before I saw briansmithwins's comment. To Brian, yes, I was surprised by the numbers myself. Those were the numbers I got when I plugged the appropriate data into a recoil calculator program. I assumed a 124 gr 9mm fired from a 16" carbine, which...

Thanks for commenting. The OP asked "why not?", not "why?" A lot of people were saying that it was impractical, bordering on impossible. I was responding to that. I don't think this would be the next big thing, so it probably isn't all that worthwhile. But it does have advantages. It would be...

I think that a simple blowback .223 is more feasible than most of the posters here believe. The bolt would not need to be all that heavy. Bear in mind that one of the biggest strengths of the .223 is low recoil. Using a recoil calculator, I found that to achieve the same bolt velocity as a...

Copper is not very toxic to humans, or at least it better not be, being that all the fresh water in our homes flows in through copper pipes!