Guiltine’s Executioner Bucking for M249 V2 vipertech -Comes with a 10mm set

-Comes with a 10mm set screw and cross pin

Material: 303 stainless steel main body

I would encourage you to complete this piston by buying Bavtechs Brass piston to complete this

The mag catch sits more flush in every position

This will improve precision

Guiltine’s Executioner Bucking for M249 V2 vipertech -Comes with a 10mm setImprove your accuracy!! Before buying a bucking, make sure that a dirty barrel or inconsistent power output isnt the cause of your inaccuracy issues! Improved O ring cutout for openbolt M249 users! Guillotine custom contact patch design. Cutout for tension O rings specifically for open bolt guns such as the VFC M249. VFC M249 option comes with 2 o rings for proper tension. I highly recommend 70 for most applications. Professional installation required.