The Sudy 23/52 release packs are PPS-43 receivers you can build in Semi Automatic using an AR-15 FCG, or Fully Automatic using the original Bolt and FCG. Developer liketoshootstuff 3D Printed PPS 43/52 Receiver Updated 4/16/23 One piece models added, internal length shortened in rear SUDY 23 3D printable PPS43 receiver UPDATED 3/3/23 Polish markings added UPDATED 3/4/23 Receiver dimensions fixed to close rear gap to lower. Buffer stl added. Updated instructions UPDATED 3/5/23 Changed hardware list. 6mm washers instead of 1/4". 6mm washers have correct O.D. UPDATED 3/8/23 Remixed Captainbarred's AR FCG trigger pocket to use #6-32 screws. Longer handguards added. UPDATED 4/16/23 One piece models added, Polish markings changed to "(11) wz. 23"