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Although I like this line of thought, why would repeated "fast" fire cause the blowback action to extract sooner than with "slow" repeated fire?
I also am drawn to think premature extraction is to blame, I think legalizing SBRs in WA would also resolve the issue.
Shorter barrel = less or no pressure upon extraction, just a thought.
A shorter barrel would probably stop this occurance. Slow fire is more in the range of 1 or 2 rounds per SECOND. For FAST fire rates up to 20 rounds per SECOND are possible (like an Uzi or Mac). The longer the barrel the greater the possibility of pressure buildup in the barrel. Yes, both ends are open when the bullet is gone and the case extracted but for how long? Take a look at some video of a sub-gun, paying attention to the gases discharged from the ejection port:
This from a firearm designed to be fired this way and there still is pressure present at the time of extraction.
FWIW, this problem occurs from time to time in semi-auto pistols when they are modified with lighter recoil springs.
Ok, we're talking about a delayed blowback operated firearm in that video. Of course there is pressure coming out the ejection port as the bolt is never really locked to the barrel extension, it's just slowed down by the rollers.
it still evades me why anyone would want one.
Let me help you understand. There are a couple of reasons. There's the "coolness" factor. Also the need to "impress your friends". It's something that most people outgrow but some never will.
Put it in the category of "here, hold my beer and watch this".
Funny thing. last week I saw the same case bulge from thing from a glock 9MM.
So I was thinking about making this new case into a wildcat cartridge. I'm gonna call it 9mm muffin top! Or muffin top 9.