Can't vouch for that model but I own 3 AM AR's that I built myself - all in RF85 and they are SAWEEET! One .556, one 6.5 Grendel, and a 10.5" pistol length .300 Blackout. JP triggers on all and tungsten powder buffers + either muzzle breaks or suppressors. Only had feed problems with crappy...
For not much more I would pick up one of these:
Plenty available at Gunbroker:
https://www.gunbroker.com/item/920757528
I love mine, it is stunning how easy it is to load/unload. And the recoil is extremely manageable. The ability to hold 15+1 2-3/4 inch shells is also quite...