As of August 1st 2022, Element Armament will not sell nor ship magazines with capacities greater than 10 rounds to the following states: California, Connecticut, Washington, D.C., Maryland, Massachusetts, New York, New Jersey, Vermont and Washington. By utilizing the Element Armament website and/or affiliated selling channels, the user/purchaser acknowledges that he/she is not a resident of the referenced states or locales and will not transport restricted or illegal items into those states.

GEISSELE AUTOMATICS – 10″ Super Modular Rail MK4 Federal M-LOK® – OD Green


Out of stock

SKU: Geissele10in.SMRFEDMK4_05-430ODG Categories: , ,


This is the same rail used to fullfill contracts for the Federal Bureau of Investigation (FBI). It’s strength, modularity and M-Lok compatibility gives users the capabilities needed to successfully complete the mission at hand.

These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o’clock positions. The Picatinny rail on the bottom of the rail, or the 6 o’clock position, is elongated in this version to more comfortably accommodate accessories. Maximum venting for heat dissipation also dramatically reduces the rails overall weight, while maintaining its same strong and rigid platform. The MK4 M-LOK rail features M-LOK slots at the 3, 6 and 9 o’clock positions as well as the upper 45° quadrants. This allows the user to keep the weight on the rail system down, while keeping the modularity and versatility to attach accessories as necessary.

HEIGHT:   2.30″
COLOR:   OD Green
MATERIAL:   6061-T6
FINISH:   Type 3 Hardcoat Anodize
LENGTH:  10″
SMR MK4 FEDERAL 10″ WEIGHT:    10.2oz (11.8oz w/ barrel nut)

Additional information

Weight 2.0 lbs
Dimensions 15 × 4.5 × 4.5 in

Geissele Automatics


Super Modular




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