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Will the Sig collapsing brace work with the adapter supplied in this kit, or will it only work with a side folder? — 2 Answers

by SharkySmilez, from CA, United States Asked on August 3, 2020

Name SIG SAUER Upper Mcx (5)
Currently Unavailable View Product
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Answered by Kurt Colbourne, Gear Expert, from IL, United States, on September 20, 2021

The rear 1913 adapter unfortunately will only fit the side folding braces.

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Answered by Thisguyoverhere, member, from OR, United States, on July 16, 2022

The previous answer is incorrect. This depends on your lower. Yes a collapsing brace will work. Yes it is a 1913 mount, but the kit is designed to work with a collapsible brace, but it has to be mounted just right. Certain mil-spec style lowers might be too thick around the buffer tube area causing the arms to snag on the receiver. That being said I have a collapsing brace on mine and have used it with 2 different lowers. It does help to shave a little off the inside of the brace rails for extra clearance but it’s not necessary.

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