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This is an extended bolt release for the PTS Masada airsoft gun. This will need some modification for perfect fitment and usage. The hole for the retaining pin is marked on the part. You will need to use a 1/16 drill bit to open up the hole on each side of the bolt release. Drill slow and do not make the hole too big or the pin will not stay in place. The pin hole is the only part that needs to modified. This is for Airsoft use only. Enjoy