INVICTUS MK-1 SERIES HANDGUARDFeatures Tension Mounting system (no more lock block) Backward compatible with original MTW barrel nuts Licensed M LOK slots on 7 sides Manufactured in house by Invictus Manufacturing, USA 6105 T5 Aluminum Milspec Black anodized Includes Rail Retention Screws x2 (MTW H 239) Inner diameter: 1. 398 35. 5mm
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