My dad asked to see my AR this afternoon because he knows i pieced it together. He told me he is contemplating building one out to use with the PSE tac 15 cross bow and just throw a .223 upper when out plinking /shooting varmints

So here are my questions

If you use the UBR is there a way to put a single point sling on it

Are the mega lowers ( forged or billet) p mag compatible. I think I want to go mega because the old man is fixing to retire after 30 something years at a nuke power plant and they have an atom on them

Has anybody used the TAC 15 upper and can give feedback on it

The UBR has QD sockets on both sides. You could use a qd sling mount and use something like an ASAP to hook into it.

I have an ASAP and love it

Can you use an asap w/ a UBR

Fraid not. The UBR has it's own built-in endplate. Sorry, that was a typo on my part in the last post. You could use something like an MS2/MS3 with it.