I have an LWRC 10.5" upper that has over 10k in rounds. I just ordered the newer 12.7" M6A3 upper with the adjustable gas system.
IMHO, the only real advantage to a piston system is its ease of cleaning. I was seriously considering another DI upper until I decided to clean three of my DI guns. That convinced me to get another LWRC - mostly because I have had a lot of great Customer Service from those guys and they were available.
A friend of mine recently bought an LMT MRP 16" piston gun. It's a lot smoother shooting than my 10.5" piston gun. I do recommend that you decide if you really want or need a piston gun because they are pretty costly. IMHO, you can't go wrong with either LMT or LWRC. I own products that are made by both companies.
Good luck!!
Last edited by CarlosDJackal; 07-23-09 at 12:38.
We must not believe the Evil One when he tells us that there is nothing we can do in the face of violence, injustice and sin. - Pope Francis I
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