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  0 of 0 people found the following review helpful:
 
5 of 5 Excellent product May 14, 2026
: Nathan S from Shelby, NC United States  
The shipping was fast. Got it in 2 days!

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5 of 5 Mas Defense and Atrius, Outstanding combination March 30, 2026
: Joe Padgett from Salisbury, NC United States  
I don’t know how I failed to discover Mas Defense until last week. I live in the Charlotte region, and to have an AR parts suppliers that is so close and so efficient is amazing.
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Yesterday I received,  The device installation was quite simple and straightforward. Took my 7.5” 300 BO to the woods. Selector functioned perfectly in semi-alto mode, Safety delect mode, and FRT mode.  Approximately 150 rounds fired, no issues in all selection modes.

Five Star Rating to Atrius Selector and MAS Defense, both outstanding.

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5 of 5 Awesome! March 4, 2026
: Josh Siler from Stanford, KY United States  
Great customer service from start to finish. Had a minor problem but the guys at MASdefense were readily available and quickly solved any and all issues! Will definitely order more in the future

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5 of 5 Great Service and Price! February 26, 2026
: Lee J. Meza from Georgetown, TX United States  
MAS Defense shipped the product quickly and had the best price I saw online. The product itself was binding when trying to switch the selector positions. I think the detents were a bit over drilled. I am working with the manufacturer trying to get warranty service as this appears to be a manufacturing issue, nothing to do with MAS Defense.

5 Stars for MAS Defense!
TBD on Atrius.

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  0 of 0 people found the following review helpful:
 
5 of 5 FRT February 18, 2026
: Robert Mancuso from Murphy, ID United States  
Works as advertised. Easy install. Recommend.

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5 of 5 Quality January 11, 2026
: Aaron from Pleasant Hope, MO United States  
Easy install.  Worked great!

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4 of 5 Atrius FRT January 2, 2026
: Bryce Griffith from Lewis Center, OH United States  
I apologize but I have not yet been able to try this out. I have it installed and it functions as it should. But that’s not saying it will work when put to the test. Buddy of mine has one that works and one that doesn’t. The FRT he has that does not work in live fire action. It functions correctly when he pulls the charging handle to cycle the gun. As does mine. Hopefully when the weather here in Ohio cooperates, I can get out try this with live rounds. Until then, I hope I can come back and edit to add more of a review.

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  0 of 0 people found the following review helpful:
 
5 of 5 Awesome product December 25, 2025
: Matthew Gipe from Chambersburg, PA United States  
Reasonably priced product… fast shipping… will purchase from MAS again…

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5 of 5 Can't get any bettter! December 25, 2025
: Frederick S. from OH  
Best FRT on the market! MAS Shipped the same day it was ordered. Awesome company!

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5 of 5 November 6, 2025
:  
Fast shipping.  Thank you.

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