I have a Bushmaster AR-15, I have it in the A2 configuration, part sentimentality and part it fits me well like in that configuration, that or a few Gunny’s beat me into submission. Mostly, I shoot service rifle matches with it as well as some coyote control; and it is one of my SHTF rifles, should that need arise. I have been wearing out gas rings between 3,000 and 4,000 rounds, and that seems more frequent than it should be. Any thoughts on that would be appreciated. I was thinking of an upgrade to a new bolt carrier group (BCG). Reliability and longevity are my key aspects that I want in a replacement/upgrade. Several that have come to the top of the list are: http://www.bravocompanyusa.com/BCM-...Auto-M16-p/bcm bolt carrier group auto mp.htm http://www.brownells.com/rifle-part...s-bolt-carrier-sku452000130-45574-102057.aspx http://www.aimsurplus.com/product.a.../M16+.223/5.56+Bolt+Carrier+Group&groupid=723 I am not married to any of the options above, they are just what I have found researching the internet and those that had good reviews. Price is always a consideration, but it is not a primary. Reliability and longevity are primary. Price is flexible as long as the value is there. All ideas and comments are welcome.