I am looking into purchasing a S&W. Your model to be exact. How has it fared for you so far? I can get it for 1,200 at my dealer.Haven't shot any of them, but my friend just got his LWRC about a week and a half ago. Hopefully I will get to shoot it this weekend.
I have held the Sig 556 and I can tell you the gun is very front heavy when compared to my S&W M&P15T. For a sporting rifle (in semi only) it seems to give the gun a poor balance. In a full auto setup I think the extra weight and its bias probably would help out. Overall the Sig is just longer and heavier than a standard 16" AR-15. Strip down of the Sig is extremely simple and would seem to be easier to clean, but this may be a moot point with a piston AR setup. Sig is solid, but there are some who question the first run guns.
LWRC has a good reputation for their quality and gas piston AR's. They are pricey though.
Don't know too much about the POF/Bushmaster gas piston AR's.
I would say that due to the high cost of the HK 416 upper, the LWRC is most economical alternative available to the HK 416. I just got mine several days ago and will post a range report shortly.
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