looking at an XM15 5.56,1/7. supposedly about 20 yo and little fired. haven't seen it in the flesh. re bushmaster: they were bought out awhile back and supposedly quality tanked. believable like all things after "buy out". does anyone have any direct experience with these? it has magpul MOE furniture-wondering if the HG is FF (could call magpul if nobody knows). trigger is AGT act". don't know that one. any input from experience or knowledge? thanks.