Stribog colt mag adapter

Machined from billet 7075 aluminum and anodized this lower frame system allows the use of Colt patter AR9 magazines with your Stribog SP9a3 or Stribog SP9a1 gen 2.  In addition to Colt pattern mags this lower allows the use of most cartridge style AR triggers and some 3 pieces triggers as well, in all cases the limiting factor is the hmamer width must be .260'' or less in width at the contact face.