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will this work with a BCM upper receiver? — 1 Answer

by Trevor, from NJ, United States Asked on April 30, 2020

Name Geissele MK4 M-LOK Super Modular Rail (4.7)
As Low As $259.99 Save Up to 15%
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Answered by Tom B, Gear Expert, from IL, United States, on August 27, 2021

Yes it will, per the manufacturer: Our rails are designed to work with Mil-Spec M4 upper receivers. The compatibility with billet receiver sets is unknown.

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Last updated 2025-11-12 UTC.