Just what I was looking for. The two lowers that I have, I bought from another individual, and needed the bolt release pin and the set screw for the rear takedown pin spring and detent is nice. Didn't need the one for tightening of the upper to the lower, but looks like it would work, as long as you back it up with another set screw. Over all a great package if needed.
Reviewed by: (Verified Buyer) Lonnie Adkins from Tennessee.