Great overall, but handguard is 12.7” not 12” - Aero Precision M4E1-T 12.5in 5.56 NATO Complete Upper Receiver with Flash Hider w/ R-One Handguard

Great quality upper, big caveat is the handguard length. You won’t be able to change the muzzle device or use a suppressor with this one on. Ideally you want the handguard to be around 0.5” to 0.8” SHORTER than the barrel for that. I ended up swapping it with a true 12” from ballistic advantage. Sucks having to replace a brand new piece due to misleading info.