The Arisaka Offset Scout Mount is designed specifically for the Surefire Scout Light M600 and M300 series weapon lights, the Modlite PLH, PLHv2 and OKW weapon lights, the Arisaka 300" 600 and 18650 Series, and the Streamlight Protac Rail Mount 1" 2 and HL-X (non-laser). It replaces the stock Picatinny rail adapter with a low profile mount which tucks the light in much closer to the handguard. When used on the side mounting surfaces of Picatinny handguards, the Offset Scout Mount places the light at a 45 degree angle and tucks it in closer to the rail system. Oriented upwards, the light is located at approximately the 1:30 or 10:30 clock positions. Oriented downwards, the light is located at approximately the 4:30 or 6:30 clock positions. Compatible with the Modlite PLH, PLHv2 and OKW, Surefire M300A" M300B" M300C" M300V" M312" M322" M312V" M313V" M322V" M600B" M600C" M600P" M600U" M600V" M600DF" M612" M622" M603V" M612V" M622V" Streamlight Protac Rail Mount 1" 2 and HL-X (non-laser), CD REIN, and Arisaka 300" 600 and 18650 Series.Features : ,Length: 1.30";"Weight: 0.7 oz, ,Hardware: One 10-32x1.25" Torx cap head screw, two 8-32x5/16" Torx flat head screws, Made in the USA.