M4E1 Threaded Complete Upper, 18" 5.56 Rifle Length Barrel, RM15, Anodized
M4E1 Threaded Complete Upper, 18" 5.56 Rifle Length Barrel, RM15, Anodized, The M4E1 Threaded Complete Upper, 18" 5.56 Rifle Length Barrel, RM15, Anodized includes the Gen 2 Enhanced Handguard! Key features include the addition of qui