I just saw this over at AR15 Dot COM and it looks is Awesome, and I have ordered a 3 pack for use in my SBR:
https://www.meanarms.com/products/detail/endomag-9mm-preorder
Converts .223/556 P-Mags to a 9mm AR-15 Block to use 9mm ammo and just use a regular Lower with any 9mm AR upper.
https://www.meanarms.com/products/detail/endomag-9mm-preorder
Converts .223/556 P-Mags to a 9mm AR-15 Block to use 9mm ammo and just use a regular Lower with any 9mm AR upper.