C&H Precision Weapons Modular Ring Mounting System 34mm. C&H utilized a modified Glock MOS footprint along with their adapter plates to give you the most versatile mounting system you can get. The optic and the ring can be mounted forward or backward with this system. It also allows you to mount virtually any pistol optic so long as you select the correct C&H adapter plate that fits Glock MOS. The C&H adapter plate must be purchased separately or along with the mount in order to use this system. Specifications for C&H Precision Weapons Modular Ring Mounting System: Manufacturer: C&H Precision Weapons Color: Black Gun Make: Glock Gun Model: Universal Gun Type: Pistol Fit: Glock MOS Quantity: 1 Package Contents: C&H Precision Weapons Modular Ring Mounting System C&H Precision Weapons ACCS-STM-34MM-MOS: Modular Ring Mounting System 34mm