Geissele’s Super Modular Rail (SMR) is a free-float M-LOK handguard purpose-built for the HK416/MR556 barrel and gas system, giving you a continuous top rail for optics/lasers plus M-LOK slots at 3, 6, and 9 o’clock for lights and grips. At 14.5″, it matches mid-length HK416-pattern uppers without needing a proprietary barrel nut. Desert Dirt Color (DDC) finish matches HK416-style builds.
Key specs: 14.5″ length · M-LOK attachment · Fits HK416/MR556 pattern uppers · Free-float design · DDC (Desert Dirt Color) finish · MFG# 05-848S
Best for: HK416/MR556-pattern AR-15 builders upgrading from a factory handguard, or anyone building a DDC-finished clone rifle.
Compatibility note: Designed specifically for HK416/MR556 barrel nut and gas system — verify your upper receiver pattern before ordering, as this will not fit a standard direct-impingement AR-15 barrel nut.
$550.00
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