I think my delton lower is getting this:
http://www.thefirearmblog.com/blog/2...ar-15-shotgun/
Thanks Brian for telling me about it, ahha
have you guys tried out the delton website? or even do a search for J&T website(a bit more expensive though)
you can pretty much design your own upper with whatever options you want.
I think I want to look for a 9mm version for this lower