As long as you have a low profile gas block, this should fit your S&W M&P15 regardless of gas length. If you have a railed gas block or the A2 sight post gas block, this will be too long as those will not fit under the handguard.
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by Brady, from MN, United States Asked on July 14, 2018
As long as you have a low profile gas block, this should fit your S&W M&P15 regardless of gas length. If you have a railed gas block or the A2 sight post gas block, this will be too long as those will not fit under the handguard.