Return to 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 7.25" M-LOK RAIL
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  0 of 0 people found the following review helpful:
 
5 of 5 Awesome March 2, 2023
: John Turgeon from Corinna, ME United States  
Love the looks of this upper! Great quality control and no complaints what so ever! Certainly be a returning customer!

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5 of 5 Nice Little Unit January 17, 2022
: Adam O from Western Colorado  
This is a nice little unit.  It is my first upper from MAS and I have zero complaints.  The fit and finish is good and I have had zero issues with the performance of the upper when shooting.  The FDE color is right in line with the standard Magpul FDE, so matching aftermarket components has been perfect.  

I am running 220 grain subs out of mine and still fine tuning my load development, but initial results show perfect accuracy.

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5 of 5 Happy with purchase December 6, 2021
: Curious George the 3rd from Slaughter, LA United States  
I came across mas defense by Google searching uppers and parts with good reviews . The finish and fit are very good, no issues cycling heavy subs and light supers , and it was shipped in a box that was very well packed . I haven't ran that many rounds through it yet but it has given me accuracy that I'm pleased with.
For the negative points which aren't anything that would stop me from getting another , are the handguard is a tad heavy/bulky...esp near the receiver on left and right side...if those qd mounts were eliminated it would be a little slicker. And when installed flush with the upper receiver , it wouldn't allow the lower pins to engage ...had to loosen it and slide it forward Just a few thousandths of an inch.
 . Ive bought a lot of other brands over the years and I'm impressed by these for the price ..

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5 of 5 May 17, 2021
: from laughlin, NV United States  


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5 of 5 Excellent Quality April 26, 2021
: MJ from Colorado  
Really happy with my .300 blk complete upper purchase from Mas. The handguard is unique and really cool. The barrel, gas block, and muzzle device options are great. Fantastic value for the price. Mas Defense is GTG.

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5 of 5 Nice upper 300 blackout. September 25, 2020
: Steven  
Fits nice with my lower, Shoots great. Got it sighted in, does what I wanted to do. It came the way I ordered. Great job Mas Defense.

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