Return to 8.3" 9MM AR-15 BARRELED UPPER - MAS DEFENSE RIDGELINE 9.87" M-LOK RAIL

Sort By:: Most Helpful Newest Rating: High to Low Rating: Low to High	Page of 2

0 of 0 people found the following review helpful:

Perfect Thursday, September 24, 2026 : Ryan Fees from Pottsville, PA United States   I was gonna build a 9mm upper part from part until I decided to get this one. And im glad I did. I used the drop down and chose exactly what I wanted and its perfect. Was this review helpful to you?

0 of 0 people found the following review helpful:

Friday, September 4, 2026 : Terry Boushie from Ironton, MO United States   Fast shipping, great prices, awesome uppers. Was this review helpful to you?

0 of 0 people found the following review helpful:

Eye catching Friday, March 15, 2024 : Brett T from Saint Louis, MO United States   When I first saw this I knew this was the upper for my pcc build! Upon receipt it’s exactly what I hoped it would be. Great build quality, not too heavy, not too light and balanced. Was this review helpful to you?

0 of 0 people found the following review helpful:

Poor shipping Saturday, March 2, 2024 : Ben Mixon from Lyons, GA United States   I would like to review your product but I haven't received it yet. The website is well laid out. The ordering process is easy but the shipping needs a different carrier.  I placed my order on the 20th with priority shipping and it still hasn't arrived.  My previous order was the same way Was this review helpful to you?

0 of 0 people found the following review helpful:

great upper and fast shipping Monday, August 29, 2022 : Dan from CT United States   The handguard has a great look yet much lighter than usual quad rails on the market and the FDE color adds the look I was going after , no complaints ! Was this review helpful to you?

0 of 0 people found the following review helpful:

8" 9mm upper Wednesday, November 10, 2021 : Stuart Stiles from Flemington, MO United States   Excellent little upper. Good quality fit and function. Looks amazing. 500ish rounds of steel cased and no issues. Lots of fun to shoot. Wish 9 mil was cheaper. Was this review helpful to you?

0 of 0 people found the following review helpful:

Great Thursday, February 18, 2021 : from Killen, AL United States   Good upper only thing is it didn't come with a charging handle or bolt carrier group. Needs to be more bold, didn't see it until my order was already in transit Was this review helpful to you?

0 of 0 people found the following review helpful:

upper reciever Monday, February 15, 2021 : Robert Schreffler from Mulvane, KS United States   although I am satisfied with the product as a whole, the finish on the upper reciever is flawed. the only reason not to recieve 5 stars. Was this review helpful to you?

0 of 0 people found the following review helpful:

9mm upper Thursday, May 7, 2020 : Ryan Peters from TURBOTVILLE, PA United States   Looks like a great fit and finish. Love the ridgeline handguard! Mated up good to my 80% lower. Shipping was really fast even during this "pandemic" Will update after firing test. Thank you MAS!! Was this review helpful to you?

0 of 0 people found the following review helpful:

Fantastic product, great price. Thursday, April 30, 2020 : Luke from FL United States   I'm not easily impressed and I value my time and money. I had searched for months looking for the perfect 9mm upper to for my newest AR pistol. I had considered building it piece at a time, but could rarely find the parts I wanted in stock and for a good price. After searching for quite some time I came across MAS Defense 9mm uppers and browsed their pistol uppers looking at all the options they offered. I settled on the 8" Ridgeline upper and TiN finished bolt to complement the great looking upper.  Great buying experience and fast shipping in these uncertain times (Corona crazyness) solidified the feeling I had made the right choice.  Arrived promptly, and well packaged. Pinned it to my Sharps Brothers lower and loaded up mags for a trip to the range the next day.  Needless to say she ran flawlessly straight out he box. Good looking pistol with all the perks I wanted for a great price.  Very happy with my purchase and look forward to many more trips to the range. Was this review helpful to you?