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What type of picatinny rails fits on the base of this upper? It doesn't look like key-mod or m-lok. — 2 Answers

by Tracy, from CA, United States Asked on January 18, 2020

Name Anderson Manufacturing EXT 10.5in M4 Complete Upper w/Extended Forearm (5)
Currently Unavailable View Product
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Answered by Carlos, member, from CA, United States, on May 09, 2020

The only Picatinny Rail it has, is the one top. As far as the sides and bottom, there is none. You would have to buy the rails, known as the “EXT” rails from Anderson manufacturer.

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Answered by sleepy, member, from KY, United States, on September 09, 2020

Anderson’s EXT rail sections

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Last updated 2026-07-29 UTC.