Uniset U-300 & U-375

1 – Receiver, 2 – Barrel, 3 – Breech Block, 4 – Firing Pin, 5 – Extractor Block, 6 – Nosepiece, 7 – Reset Pin, 8 – Reset Pin Cap, 9 – Trigger Assy, 10 – Sear Pin, 11 – Trigger Spring Pin, 12 – Piston W/Ring, 13 – Firing Pin Screw, 15 – Handle, 17 – Breech Block Spring Pin, 18 – Breech Block Spring, 19 – Firing Pin Spring, 20 – Sear Pin Spring, 21 – Trigger Return Spring, 22 – Reset Pin Spring, 23 – Extractor Spring, 24 – Extractor Ball, 25 – Sear Roll Pin, 27 – Piston Ring, 28 – Guide Ball, 29 – Handle Bolt, 30 – Buffer, 32 – Trigger Hinge Pin, 33 – Stabilizer