Our TechT G3 Tooless Backcap will work with all Dangerous Power G3 Markers. The TechT Tooless Back Cap allows a player the ability to remove the bolt guide without the use of an allen wrench. The Back Cap is available in Dust Black & Dust Silver finishes, it also includes a TechT Paintball Jewel to let everyone know you mean business. It is a great product for any player wanting to add conveince and accesibility for maintaining thier G3 Marker. The TechT Tooless Back Cap will work with the G3 Spec R. The Back Cap will not work with the TechT G3 L7 Engine Bolt.