CMMG Mk4 AR-15 5.56 NATO, 16.1 in DI Rifle, Free-Float M-LOK, FDE Two-Tone, Magpul CTR, 30+1
This CMMG Mk4 is a USA-made AR-15–pattern rifle chambered in 5.56 NATO with a 16.1 in barrel and direct impingement operation. It stands out with its free-float M-LOK handguard and continuous 1913 Picatinny top rail, two-tone FDE/black finish, and quality construction featuring a billet 6061-T6 upper and a forged 7075-T6 lower. It comes ready to run with polymer flip-up sights installed, a Magpul CTR 6-position stock, and three 30-round magazines.
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 Details: The exterior shows a few minor, superficial scratches and small blemishes from light handling. Surfaces are well-kept with no notable wear patterns.
What's Included
- Two-point adjustable sling (tan), installed
- Polymer flip-up front and rear sights (installed)
- Magpul MVG vertical grip for M-LOK (installed)
- M-LOK QD sling socket installed on handguard
- Magpul CTR adjustable stock (installed)
- Three 30-round polymer AR-15 magazines (Magpul PMAG GEN M3 and CMMG-branded)
The Mk4 platform combines a billet 6061-T6 aluminum upper with a forged 7075-T6 aluminum lower for a solid, well-mated receiver set. The upper is equipped with a forward assist, shell deflector, and ejection-port dust cover, and the bolt carrier is marked CMMG. Operation is direct impingement for a proven, standard AR-15 manual of arms.
Its 16.1 in barrel ends in a threaded muzzle with an A2-style flash hider installed. A long, free-float M-LOK aluminum handguard provides ample mounting space and aligns with a continuous 1913 Picatinny top rail across the receiver and handguard. Polymer flip-up sights (MBUS-style) are installed and ready for use.
Furniture includes a Magpul CTR adjustable 6-position stock on a carbine receiver extension, offering a stated length of pull from 10.5 to 13.75 in. The rifle wears a two-tone FDE/tan and black finish and features a CMMG-branded textured polymer pistol grip. Selector markings are SAFE/SEMI, with a manual safety selector.
This Mk4 uses STANAG/AR-15 pattern magazines with a 30+1 capacity; three polymer 30-round magazines are included (Magpul PMAG GEN M3 and a CMMG-branded mag). A Magpul MS1 two-point sling in tan is installed, and an M-LOK QD sling socket and Magpul MVG vertical grip round out the included accessories. Made in the USA.