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Q&A for Rainier Arms Rainier Industries Pro Series Mk2 Quad-Rail AR-15 Handguard — 2 Questions & 1 Answers

Name Rainier Arms Rainier Industries Pro Series Mk2 Quad-Rail AR-15 Handguard
As Low As $220.00 Save Up to $10.00
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Q
Fireemt95, member, from IL, United States, asked on April 07, 2025

Looking to change out the rail on my ar10 with a quad rail. Seems like quad rails for ar10s are very hard to find. Will this fit on an ar10?

A
Answered by Demmons, member, from OH, United States, on October 08, 2025

No, handguards are not interchangeable between small frame and large frame AR platforms unless the rifle you have is a specific small frame AR-10, like the Rugar SFAR. Further, your AR-10 pattern is going to determine what rails you can use. DPMS High being the most popular, followed by DPMS low, and Armalite. Note, Palmetto State Armory uses a proprietary rail system height and will only properly fit with their own handguards. Centurion, Samson, and SLR make high quality quad or semi-quad rails for DPMS high patterned AR-10s.

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Mike, member, from FL, United States, asked on January 17, 2025

Will this fit with the M&P 15T ???

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