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Message: <blockquote data-quote="John R. Reist" data-source="post: 3165852" data-attributes="member: 39483"><p>Not trying to bring this thread back to life just for Halloween,but wanted to chime in and pick yalls brain. I put together a 10-1/2" AR pistol recently and have been having some short cycling issues with it. The assembled upper is from palmetto state (carbine length gas system).I built the Anderson lower from  a Toms Tactical parts kit and added a PHASE 5 TACTICAL bolt catch.Also added an adjustable gas block. I ran a mag of PMC bronse223 at first and after about 20 rounds it started short stroking(started not feeding the next round). I looked in the action &barrel and there was lots of unburnt powder residue. Cleaned and lubed the heck out of the gun and tried American Eagle 223,It ran great other than the bolt some times not locking back on the last round.Next tried some Federal 556 62g greentip ammo and ,it never missed a lick functioning .Lastly my brother tried some Wolf steel case and it will not cycle that stuff at all. So the gas port dia is .075", What do you all think of the idea of drilling the port open to .077" or .08"? Good idea/ bad idea? -Haven't been here before.  Thank you.</p></blockquote><p></p>