shamayim, here are a few more pics. This profile shows it as a GAU-5AA (no forward assist). From the pic above, you can't tell it's not an XM177-E2.
Slv2fun, the stock is an aluminum 2 position stock taken from a preban Eagle Arms. The stock appears to be a powder coat type finish. It's not an exact repro stock, but it's close enough for me.
Disco_Stu_TX, as stated, the fake moderator with washer was purchased from Total Silence. The barrel was purchased from
C & S Metall Werkes. The barrel started out as a 20 inch (with 1x12 twist). C & S shortened the barrel, drilled a new gas port, and moved the front sight. The barrel length is now 11.5 inches. The barrel functions perfectly in full auto.
I used Duracoat and the upper receiver is a close match to the lower, but not perfect. Reason, the lower is made of stainless steel. I've always liked the "classic" Colt commando look. They are just too cool.
Dan