[gaijin]

Nice build.

I have the PA's (Holosun) 2 Minute RD on a couple of "truck gun" pistol AR's.
NO issues. I'd do it again.

 

[gaijin]

^^ Holy crap, that's a mess.
Looks like the wheeler was unable to get a proper purchase on the nut.
I'd try a different armorer's tool.