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Old June 8, 2001, 05:41 PM   #6
Senior Member
Join Date: April 8, 2000
Posts: 866
Left Out

One thing left out in this discussion. Blowback pistols are .380 caliber and under. They can't handle anything more powerful. Physics dictates that a more powerful cartridge would need a more massive slide and stiffer recoil spring to work properly as you need that resistance of the mass of the slide and stored energy in the recoil spring to have enough gas pressure to send the bullet on it's way. Not practical for a pistol. Okay for a cheap sub-machine gun though (like the M3).

The recoil lock-up system (most are Browning design) as indicated in the previous posts, locks the barrel to the slide until the bullet leaves the barrel, thereby creating the proper level of gas pressure to make the round effective.

All recoil systems have cartridge extractors. Most but some blowbacks do not.

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