Colt 601 Build

[Madcap]

It's been a while since my last post after completing a M12 Trench Gun repro build and now interest in retro AR15's has bitten.

I've been lucky to acquire an early original USAF complete Colt 604 upper that I hope to complete into a semi-auto legal version. PSA and H&R seem to be one of the best options for lower receivers but don't seem to offer clone M16 stripped lowers that I find. So far that would seem to be the closest possible period option if they had them.

As a note, the early style rear sight on this receiver has no "Arrow" on the receiver frame around the windage drum and the drum has no arrow indicator either. I think some of the windage drums had a direction arrow included with the numbers if the direction arrow wasn't visible on the receiver which seem to be the most common.

I'll look forward to any advice, info or experience that might help with the project. I'll also try to post some photos.

Thanks,

Dick