Colt M4 Carbine 5.56 NATO, 16 in AR-15, CR-Series Lower, Geissele SSA-E, PRI M84 Gas Buster, KAC QDC 3-Prong
This customized Colt M4 Carbine pairs a CR-series M4 CARBINE-marked lower with a purpose-built upper and premium components. Highlights include a Geissele Super Semi-Automatic Enhanced (SSA-E) two-stage trigger, a PRI M84 Gas Buster AR-15 Charging Handle Military Big Latch, and a Knight's Armament 5.56 QDC 3-prong flash hider. It features a flat-top, T-marked upper, a drop-in, non–free-floated carbine-length quad-rail, and the classic A-frame front sight base. The rifle is in very good overall condition with an excellent, mirror-bright bore.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This firearm is in great shape. There are some minor scratches and blemishes present. The bore is clean and shiny.
What’s Included
- 1x 20-round aluminum STANAG-pattern magazine (GI-style)
- Owner's manual
- Ladder-style rail cover panels (set)
- Folding rear backup iron sight (installed)
- Knight's Armament 5.56 QDC 3-prong flash hider (installed)
This rifle is built on a CR-series Colt M4 CARBINE-marked lower (CR-prefix) with receiver markings including "US PAT 8234808" and a 2D data-matrix. The upper is a flat-top with a T-marked Picatinny rail, and both receivers are aluminum. The configuration is a mixed-component build and not the factory monolithic CR6940 setup.
The 16 inch M4-profile barrel uses a carbine-length gas system and is threaded, capped with a Knight's Armament 5.56 QDC 3-prong flash hider. A fixed A-frame front sight base doubles as the gas block and includes a bayonet lug and sling swivel. The handguard is a non-monolithic, drop-in carbine-length quad-rail retained by the standard delta ring and front handguard cap, with numbered slots.
Controls and fire control are upgraded for precision and handling. The Geissele Super Semi-Automatic Enhanced (SSA-E) two-stage trigger provides a clean, predictable break. Charging is handled by the PRI M84 Gas Buster AR-15 Charging Handle Military Big Latch, and the rifle uses a standard manual safety.
Furniture includes a six-position, collapsible M4-style stock with a stated length of pull of 10-13 inches and a rubber finger-groove pistol grip. Sighting is handled by the fixed A-frame front sight and an installed folding rear backup iron sight. Chambered in 5.56mm NATO, capacity is 20+1 with the included magazine.