I have a Bushmaster so far so good, only shoot about 200 rounds a year through it though. Also look at Rock River Arms, my brother is a gun nut and says they are great for the money. He has 2 Les Baers Super Match and Flat Top, talk about SWEET!

Don't worry about a "piston gun" buy good H&K mags instead and buy ANYTHING BUT a Dancing Pony (Colt)

& 6mm PPC

Id check out the HK 416 , thing is legit

Id check out the HK 416 , thing is legit

while your at it check out the HK M468