Geissele Super Modular Rail MK4 M-LOK

Ultra-Rugged Design

The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-rugged M-LOK option. These purpose-built rails feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6, and 9 o’clock positions. Maximum venting ensures heat dissipation and significantly reduces overall weight while maintaining a strong and rigid platform.

Versatility and Modularity

Utilizing Magpul’s M-LOK technology at the 3, 6, and 9 o’clock positions, as well as the upper 45° quadrants, the SMR MK4 offers full customization for the user’s unique needs.

Enhanced Barrel Nut Design

• Barrel Nut Length: Geissele’s proprietary 2.25" long barrel nut provides extended surface contact.
• Improved Stability: Creates a straight and true platform along the entire free float rail.
• Accuracy and Zero Repeatability: Maintains precision during disassembly and reassembly for maintenance.