I've got a PSA 8.5" upper with PSA BCG that's been pretty reliable. I'm waiting for SGW to get in some of the Aero m4e uppers so I can transplant the barrel into it. There's nothing wrong with the PSA receiver mine was forged by Anchor Harvey I just wanted the upper receiver to match my Aero lower. I'm also waiting on the Hera CQR furniture from wolverine to be exported from Germany to complete it. Right now it's got a MFT minimalist stock on it. Just keep in mind that they are going to be loud, I always double up with ear protection when using it.
Wolverine shipped my CQR furniture last week and finally had a chance to install it, here's my SBR.
I'm still waiting for SGW to receive it's latest AERO order so I can swap out to a M4E Upper and an Aero 7" keymod rail.
I'm still running a standard A2 Flash hider on mine, I'm curious to find out what muzzle devices other's are running on their short barrel AR's. I keep looking at Griffin M4SD flash hider or the Strike Industries Venon Flash Hider to replace the A2 anyone have any suggestions? I'd like to stick with a flash hider as I don't want to be that guy on the firing line sending gas to the people next to me.
For those of you wondering about the build here it is
Aero Stripped Lower (SGW)
S&J Hardware AMBI LPK (S&J Hardware)
S&J Mil-Spec Buffer tube with Carbine Buffer (OST)
Wolff 16504 standard buffer spring (Colonel Mustard)
Troy Ambi Mag Release (Rampart)
8.5" PSA Complete Upper with PSA BCG 7" 2A Armament keymod rail 1:7 twist barrel (IRG)
Hera Arms CQR stock and front grip (Wolverine)
Vortex StrikeFire (Grouse River)
AXTS Raptor Charging Handle (CanadaAmmo)