Changed rating - Aero Precision M4E1 Enhanced 10.5in 5.56 Barrel Quantum Handguard Complete Upper Receiver with Flash Hider

originally rated this high, but had not actually used it yet do to too many things going on in life. finally added it to a working lower and have had nothing but problems. FTE, Double Feed, etc. No matter what bcg, no matter what buffer weight...the thing wont cycle flawlessly at all. I am not sure if its a mfg defect or what but I've built plenty of ARs and just never had this many problems.

So far, Aero's "name" means nothing to me. Have to now go through the hassle of going direct to mfgr because optics planet only has a 30 day return window. Not happy with OP either.