Ene cap/Spacer and screw/bolt for Receiver Extension A2/A1 buffer tube stock assembly - OPTICSFACTORY
Canto Arms Receiver End Cap with QD Socket - Canto Arms
US Machinegun: *Buffer Tube Adapter for MPA 9mm (Newer Models), MASTERPIECE ARMS / VULCAN / VELOCITY ALL 9MM, MINI SERIES & 5.7x28mm SERIES - UPGRADES, ADPT-MPA9M
Ene cap/Spacer and screw/bolt for Receiver Extension A2/A1 buffer tube stock assembly - GUN1.COM