MPX Spare Parts Kit FOR SIG SAUER (WITH ADJUSTABLE PLUG)

Parts kit does not come with barrel screws and nuts, or springs (unless ordered that way via drop down)pic is for reference only. 

Kit contains commonly replaced parts for the Gen II in a divided small plastic case for easy identification and access. These parts are all manufactured in the U.S.A. with exception of the torque keys

Contains: 

1 Gas pistons with rings

1 Gas plug with rings

3 McFarland Style Rings for the gas valve/plug

9 Gas rings for the piston

1 Gen I or Gen II firing pin with spring (no option for Gen II without Spring)

1 Gas plug detent

1 Gas plug detent spring

1 Gas plug detent pin

5 Extractor springs with rubber inserts

2 Extractor Pins 

2 Ejector Torx Screws