Quote Originally Posted by Diamondback View Post
With barrel nut, frontplate and flash hider the barrel weighs 35.16oz.

BCG and CH removed but MBUS3 still on, the backplate and upper assembly weigh 12.13oz.
Thank you. Please tell me if any of this looks off.

8.35oz Aero Precision APAR501603AC assembled upper
1.06oz MBUS3 REAR
2.72oz QRB backplate

1.7oz MI CR/SLH steel barrel nut -- may include 0.2oz torque plate and/or screws
21.8oz Rosco Bloodline 12.5” 5.56 NATO
0.85oz Rosco gas tube (other carbine gas tubes listed at 0.6oz)
1.9 to 2.15 oz A2 flash hider
1.5 to 2.5 oz Rosco 0.750 gas block -- no reasonable weight listed, estimated range
6.2 to 7.9 oz QRB frontplate

Total 2-pin QRB weight: 8.9 to 10.6 oz.