Thinking about getting a class 3 item


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SATX man
August 13, 2010, 06:20 PM
I been thinking about getting a SBR and silencer for my AR I have done some research about doing a trust and filling out forms for the items, but with a SBR are there some issues. A co-worker told me that his short barrel he broke a lot of bolts, extractors and buffer springs. With a SBR is there a higher failure rate?

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rcmodel
August 13, 2010, 06:25 PM
Yes.

Short barrel AR's are subject to over-gassing in order to get them to work at all.
The gas port is by necessity, closer to the chamber, so bore pressure is much higher at the gas port then normal in a carbine or rifle.

rc

SATX man
August 13, 2010, 06:30 PM
OK thanks RC so the same logic applies to a Draco and Krink?

rcmodel
August 13, 2010, 06:37 PM
It doesn't seem to be as much a problem with piston guns like those.

Port size in the barrel controls how much gas gets to the piston, and they can bleed off any excess not needed at the end of the piston stroke.

Different deal with an AR direct gas impingement system.

rc

taliv
August 13, 2010, 09:05 PM
if you get a barrel that was DESIGNED to be short, and/or run a heavier buffer, it's not really a big deal. They can be made to function reliably.

however, if you just go and hacksaw off the end of a regular 16" carbine length gas barrel, and keep the standard buffer, yes, you're going to beat the crap out of the gun every time you pull the trigger.

TexasRifleman
August 13, 2010, 09:28 PM
I agree with taliv. I have an SBR AR with an 11inch barrel that has well over 5000 rounds through it with no malfunctions or breakages not magazine or ammo related.

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