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Posted: 11/16/2004 4:56:57 PM EDT
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I've read a lot of threads here, I've learned more than I possibly imagined, but one thing still has me stumped. What is the use of the gas system? Why not just use the force of the round to push the bolt back like in a typical auto handgun? The slide moves back solely on the gas thru the gas tube? And why do they do it that way? |
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Since nobody else will answer......this is a more interesting question than it would first appear. The typical answer would be, "Of course you can't do that, the rifle rounds operate at MUCH higher pressures than pistol rounds, the typical delayed blowback of the swinging link/browning design won't take it." However.....some of the newer rounds for pistols such as .460 Roland, 9x23mm operate CLOSE to the 60,000PSI range...... so I'm not sure you COULDN'T build a rifle that would work with delayed blowback. A better design would be some thing like the short recoil design of the original Auto-Mag.....the barrel and bolt travel together backwards while a cam on the bolt engages a slot in the frame until the pressure drops, then the slot twists the bolt to unlock from the barrel, and the bolt continues rearward to eject the empty shell, then for forward to continue the loading cycle. The browning BAR (hunting rifle) works like this..... The disadvantage (I'm guessing) is that the barrel needs to move rearward for a certain distance....which probably affects accuracy is some way.....not a big concern for a pistol which generally is used within 7 yards, but not so good for rifles, which are used at longer distances...... AoD |
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