Spuhr Short Front Grip for Spuhr Interface Forends 2.85in. The R-100 was developed primarily for use on platforms such as the MP5 or AR but can also be used on other platforms such as the G3 and G36 etc. The R-100 attaches to the bottom of the forend using two M4x8 Torx 20 screws Specifications for Spuhr Short Front Grip for Spuhr Interface Forends: Manufacturer: Spuhr Length: 2.85 in Width: 0.63 in Weight: 1.7 oz Package Contents: Spuhr Short Front Grip for Spuhr Interface Forends Screws Spuhr R-100: Short Front Grip for Spuhr Interface Forends 2.85in