Seekins Precision SP 300BLK 8" MCSR Rail Billet M-LOK Upper Complete BCG Charging Handle

Factory Built 300 Blackout Upper is fully Warranteed by Seekins as a complete upper receiver group. Receiver is CNC machined from a solid billet of 7075-T6 aluminum to Seekins Precision exceptional standards, far exceeding mil-spec requirements. The receiver and included MCSR suppressor ready Hand Guard top rails are seamless, providing monolithic receiver performance and maximum optics and accessory mounting options. Both the receiver and hand guard are Type III Class 2 Hardcoat Anodized matte black.

Extremely lightweight and infinitely adaptable because of the MLOK attachment system, the included hand guard is perfect for tactical and competition use. Precision machined from 6061-T6 aluminum, it features a top Picatinny rail and M-LOK slots at 3, 6 and 9 O’clock positions for solid mounting of accessories where needed.

The complete upper come standard with a match grade barrel in .300BLK. Unlike conventional upper receivers, the Billet gas system can be finely tuned for performance and reliability because of the included Seekins Precision Adjustable Gas Block. The gas block and Gas Tube are Melonite coated for reliability and ease of maintenance. The internal dimension of the MCSR V2 has increased to 1.8" to accommodate most suppressors on the market. 

Seekins uppers are compatible with Mil-Spec lower receivers. 12.5" M-LOK MCSR rail system.

        CNC Machined from solid 7075-T6 Billet aluminum
        Aggressive, unique design lines only offered on Seekins Precision Billet uppers
        M4 Feed Ramps
        Mil-Spec Full length 1913 picatinny top rail that allows seamless mounting with handguard
        Type III Class 2 Hardcoat Anodized Finish
        Melonited Adjustable Gas Block, Gas tube and M16 Bolt Carrier Group
        5 Machined in Anti-Rotation QD sling mounts
        Scalloped rails to remove all sharp edges for comfort