G&G 300 round GTP9/SMC9 Drum Magazine riser and durability Performed accurately and Length:XR 10" BBA2100000007612 Chronographs no rattling mid cap

G&G 300 round GTP9 SMC9 Drum Magazine riser and durability Performed accurately and Length:XR 10" BBA2100000007612 Chronographs no rattling mid cap and durability Performed accurately and consistently with HPA PolarStar Engines on standard M4 M16 platform Precision Rotary Dial Knob for fine hopup adjustments Re engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R Hop and Standard Hop to keep the BB shooting accurately and consistently on every single shot Removable Steel Pivot Pin for ease of setup and maintenance Accepted the HPA PolarStar Engine M4 nozzle length Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use Wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobbling 02 Tightbore Inner Barrel