I have 3 new AR15 striped lowers, Superior Arms marked 5.56mm Forged 7075 T6 Aluminum . They also have a Trigger adjustment screw . These are unused, I am moving on to a different project and would like to sell. Or if someone a has a Mega Arms Maten Ambi upper/lower receiver set ,I might be interested. PM me with any Questions, or if you want one. $220 ea Located in Whatcom County I can get pics later if need be. Thanks for looking.