I have a Areo M5 setup.Took the 16" barrel down to 14.5 and put a Battle Comp on it,had it welded on to get to 16.1 overall lenght.If I had to do it again I'd put an AAC breakout on the end.Had issues with FTE and replaced the recoil system with Armalite parts: buffertube,spring,and buffer.Damn nice rifle for the money.Has a Rodger super stock,LaRue A-peg grip and a LaRue trigger a brother on this forum turned me on to.I'm thinkin this will be my deer rifle this season.