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Originally Posted by Bluntforce
Is there anything that can be done to increase reliabilty, i.e. different weight of BCG, buffer weight or spring strength? Does bullet weight have any part in this equation?
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I have fired many thousands of rounds of 5.56 through 14.5 inch barrels and carbine gas systems, with bullets of the following weights: 50, 55, 62, 69, 77 grains.
In rifles of top quality manufacture (Daniel Defense, Noveske, Colt, or similar) I have had no problems.
However, many people experience trouble with the more economically priced rifles (CMMG, DPMS, Rock River, etc.). This is because they lower the price by sacrificing product quality.
You can replace the LPK, buffer tube, buffer spring, recoil buffer and BCG with proper M4 milspec parts. Then assuming that your barrel port and gas tube line up correctly, the gun should run great. Or you can sell the budged AR15 and fork out a bit more money for one of the premium guns.
This article has some info on quality parts vs. budget parts:
http://www.thenewrifleman.com/the-ar...a-great-rifle/
It is true that the carbine gas system has higher peak gas pressure and supposedly slams the action harder. Maybe over 50,000 rounds that will matter. I have not found that it matters with over 10,000 rounds per gun, if the gun is constructed using milspec or better parts.
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The chamber pressure on a carbine gas system and a 16″ barrel can average around 25,000psi while a rifle gas system on an 18″ barrel can average around only 17,000psi, a reduction of over 30% in pressure. All of that extra pressure can stress the parts of your BCG and cause premature bolt failures, among other problems.
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http://apdmarksmanshipteam.org/blog/...15-gas-system/