Geissele 9.3" M-LOK MK8 Black Super Modular Rail 05-284B

Geissele 9.3" M-LOK MK8 Black Super Modular Rail 05-284B was one of the first rails on the market built specifically around Magpul's M-LOK standard, and the 9.3" length gives that early design work a real short-barrel testing ground.

This Geissele SMR rail locks to the receiver through a proprietary 2.25" barrel nut, longer than a standard nut and offering considerably more contact surface with the upper - that surface contact is the reason the rail stays straight and true through repeated removal for maintenance, not just a spec-sheet claim. Maximum venting at the lower 45° quadrants cuts weight while helping a shorter barrel shed heat faster, since heat buildup is more concentrated on compact builds where the barrel and gas system sit closer together.

M-LOK slots run at 3, 6, and 9 o'clock plus the upper 45° quadrants. At 8.4 ounces bare and 10.3 with the barrel nut, this MK8 Rail stays genuinely light for a rail this rugged - no tradeoff between low weight and actual rigidity here.

Key Features:

• 9.3" free-float length, full-length Picatinny top rail
• M-LOK slots at 3, 6, 9 o'clock plus upper 45° quadrants
• 7000-series aluminum, Type III hardcoat anodized
• Proprietary 2.25" Geissele barrel nut
• Weight: 8.4 oz bare, 10.3 oz w/ barrel nut
• Black finish
• Fits mil-spec AR-15 upper receivers
• Compatible with standard mil-spec M4 upper receivers

This Geissele MK8 rail is a solid pick for anyone building a compact carbine who wants proven design pedigree over a newer, unproven alternative.