Mark,
One thing I do on a build it try and tweak the gas tube as much as possible to not resist the carrier moving forward.
I do this with the upper upside-down as the magazine cartridge column forces the Bolt Carrier against the inside top of the reciever (wear patterns will confirm this).
I want a lubed BC only to close at the lowest possible incline with the least felt transition over the tube as possible.
I tweak under the handguards and the end if necessary.
The carbine length tubes are most critical as they are the shortest (ignoring pistol as I have no desire to fool with those abominations).
The longer the tube, the better it flexes and 'guides' into the key with lesser resistance. The shorter the gas tube,the straighter the shot you need to try and achieve. Shorter tubes have a greater diameter vs. length and are stiffer in comparison.
Feel the tube lightly with the tip of a finger as it slides into the mouth of the key. You can feel the direction of the deflection if you are careful. also watch the tube right where it comes out of the reciever.
Last edited by Heavy Metal; 08-24-12 at 21:50.
My brother saw Deliverance and bought a Bow. I saw Deliverance and bought an AR-15.
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