Nine Ball SIG Sauer M17 GBB Airsoft Custom Trigger (Silver)The Nine Ball Custom Trigger is a straight trigger designed for the SIG AIR P320 M17 GBB Pistols. The trigger is adjustable for length of stroke and reset by using an Allen key. This allows users to have faster and easier trigger pulls. Compatibility: SIG AIR P320 M17 Series Gas Airsoft Pistols Includes: x1 Nine Ball Custom Trigger for SIG AIR M17 P320 GBB Airsoft Pistol Silver