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Description
Mark 18 Mod 0 Close Quarters Battle Receiver (CQB-R), 5.56x45mm in a 30-round STANAG magazine. Used by US Navy SEALs and NCIS (the real ones), it's a standard M4A1 lower receiver with a 10.5" barrel, making it practically a PDW. The upper receiver is designated "CQB-R" and the entire weapon is designated "Mark 18 Mod 0". I added a Hogue wrap-around pistol grip, a custom quad-rail handguard, and the front and rear flip-up iron sights.

Description
Mark 18 Mod 0 Close Quarters Battle Receiver (CQB-R), 5.56x45mm in a 30-round STANAG magazine. Used by US Navy SEALs and NCIS (the real ones), it's a standard M4A1 lower receiver with a 10.5" barrel, making it practically a PDW. The upper receiver is designated "CQB-R" and the entire weapon is designated "Mark 18 Mod 0". I added a Hogue wrap-around pistol grip, a custom quad-rail handguard, and the front and rear flip-up iron sights.