Quote Originally Posted by ray1970 View Post
Looks like someone took a DCM rifle type free-float tube and retrofitted it to a mid-length barrel to me.

Thats what he did, interesting project and very cost friendly from go.

I have a few MI drop in rails. YHM FF, Troy, samson etc. Not really a full quad rail guy, however if you act quickly when posted for sale ,used has been very wallet friendly for me. I scored a YHM quad carbine, ball milled the top and installed on my AA SBR for less than 1/3 the price of new.