Here are a few of mine....
Colt USA Model GAU 5/5 (clone, based on Colt SP1 Carbine) & Colt USA Model 601 (clone, based on Colt SP1)
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HK 416A5 (clone, based on HK MR223) & Colt USA LE-901 (re-branded by Colt Canada as the C20 Sniper Rifle)
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Aero Precision .300 Blk (w/ Maxim Defence Buttstock and Daniel Defence FF Handguard) & LWRCI M6IC A5 Carbine
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Colt Canada C8 (semi-auto LE Surplus, unfired) & Colt Canada SA15 (semi-auto C8 Flat-Top Heavy Barrel)
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MD buttstocks fit tight into the shoulder.
Not all lose and floppy like many.
An AR should feel like a solid piece of Aluminum and not rattle.
Take the grip and fore grip and try to break the upper and lower in half. Should be zero flex.
Millimeters matter at 25 yards.