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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 01-04-2015, 3:15 PM
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Default what is the difference between these two ar pistols?



I don't understand how one pistol works without a tube at the back and the other doesn't. Can you guys explain it to me?...
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Old 01-04-2015, 3:17 PM
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One is a piston one is a DI.

Piston is a "ram" rod like an ak. So buffer tube is not needed.
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Old 01-04-2015, 3:21 PM
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The one on the bottom (DI) needs a buffer in order to operate, which is why the buffer tube is not considered a stock.
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Old 01-04-2015, 3:35 PM
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The above pistol looks like an Olympic Arms OA-93, which uses a recoil piston system mounted above the barrel, similar to the AR-18 design, so a buffer tube behind the action isn't needed.
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Old 01-04-2015, 3:36 PM
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Pistol - DI

Different return spring design. One is in the tube, one is like an AK.
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Old 01-04-2015, 4:25 PM
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Quote:
Originally Posted by helpfuljack View Post
The above pistol looks like an Olympic Arms OA-93, which uses a recoil piston system mounted above the barrel, similar to the AR-18 design, so a buffer tube behind the action isn't needed.
Correct ...I have an OA93 and your identification is 100% correct
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Old 01-04-2015, 4:59 PM
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Quote:
Originally Posted by 220 View Post
The one on the bottom (DI) needs a buffer in order to operate, which is why the buffer tube is not considered a stock.
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Old 01-04-2015, 5:46 PM
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The OA93, as in the photo, is indeed a DI operating system. Not Piston as some have claimed. Difference is recoil spring above and in front of carrier instead of behind and inline.

Last edited by Dezrat; 01-04-2015 at 5:55 PM..
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