Heckler & Hoch HK MR556A1 / HK416 A5.56 mm și Walther HK 416 D145RS Semi-Auto .22LR AR Rifle / Carabină (Strike Industries SI SLICK Handguard Rail for Heckler & Hoch HK MR556A1/HK416 A5.56 mm and Walther HK 416 D145RS Semi-Auto .22LR AR Rifle/Carabine)