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Complete Upper Features
Duty grade upper receiver with M4 feed ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized. BCG is M16 Profile, MPI Magnetic Particle Inspected tested, 9310 steel bolt with extra power extractor spring with black insert, properly staked gas key, black nitride coated.
Geissele MK8 Rail
The SMR MK8 is one of the first rails available to utilize the Magpul M-LOK technology. These rails are designed to give the user full modularity while maintaining a strong and rigid platform. Maximum venting at the lower 45° quadrants create maximum heat dissipation and also dramatically reduces the rail's overall weight. Utilizing Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45° quadrants. The SMR MK8 is both versatile and modular, allowing the user to tailor their platform to his or her unique needs.
Inner Diameter: 1.35"
Outer Diameter: 2.11"
Weight: 7” Rail - 8.9oz