Like posters Anarchocap and Smokin338, using similar components I have had great success and fun w/ my AR build in -39mm. Also recommend the ASC mags. I added a JP Enterprises adjustable gas block and tuned it to the bulk milsurp brand that I have cases of ammo of. All ejected empties would land in a 55-gal drum of I positioned it at the same spot whilst firing.
I call it my ‘308 short’ AR and love the heavier thump than pissy 5.56 loads. With ammo it LOVES I’ve shot sub-MOA groups at 200-yrds, e.g., PMC jacketed SPs. Mine wears an old Trijicon 1-4X w/ flo red triangle that Trijicon re-charged for me, sweet! It is my crappy weather deer rifle using that PMC ammo, in 5-round mags.
Given that 10-shots are a group and 5-shots may be a favorable trend ... know that just one good 3-shot group can make you an instant internet superstar!
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