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Old May 4, 2010, 10:12 AM   #2
martin08
Senior Member
 
Join Date: February 2, 2009
Posts: 181
The three most common issues for short cycling are gas system leaks, chamber-to-casing resistance and spring installation.

The best way to check for gas system leaks is to plug the chamber and blow into the muzzle. A hissing with resistance to blowing is good, a "whoosh" sound is bad. Try another tube and piston that is known to be good.

Lacquer, carbon, burrs, etc. in the chamber can cause the shell casing to stick. Polish the chamber.

Operating spring in backwards. Squiggly end goes into the carrier first.

Some less common items.

1. Buffer (but you removed that)
2. poor edge or alignment of extractor
3. Some receiver cover mounts for scopes with set screws can deflect the cover into the bolt carrier when tightened down and cause drag.
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