Return to 10.5" 300 BLACKOUT BARRELED UPPER - YANKEE HILL 9.29" DIAMOND

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.300 Blackout SBR Upper August 1, 2019 : from Nashville, TN United States   Super fast shipping and Zack took time to answer all my questions. Very pleased with this value. Was this review helpful to you?

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Yankee Hill 10.5" Blackout June 26, 2017 : David W   This is a great upper, light and very well made i was more impressed with it than I thought I would be. I can't wait to get it built and take it to the firing range, great quality. Was this review helpful to you?

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awesom!!! December 28, 2016 : Brant C   After ordering somewherre else due to referral and having to cancle 60 ds later because I didnt get my upper.I searched the internet and found Mas Defence. I order and left a note after. I was emailed with in the hour to assure me i was in good hands. Not only did I get my upper in 5 d it looks to be High quality. I would reccomend to anyone and I have reccomended already. Thanks MD for your being professional in service with the high qualit also Was this review helpful to you?

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Quality December 25, 2016 : Brant C   I just ordered upper from mas defense and they said it would take a bit longer because of the demand. It was at my house in 5 ds. I emailed them when i first ordered with questions on time it wouldtake. They responded with in the hour and helped me with my concerns. I have not put together yet due to christmas but upper looks like great quality. Was this review helpful to you?

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Beautiful Piece January 13, 2016 : John R   So excited to have this barrel for my new upper build. Perfect fit. High quality. Fast shipping and excellent customer service which keeps me coming back to MAS Defense. Would recommend. Was this review helpful to you?

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YANKEE HILL 10.5 " 300 Blackout Upper April 17, 2014 : Jakob M   On the site it said to be prepared to wait up to 5 business ds for the item to be shipped, so that it what I was prepared for. Instead my upper arrived at my house less than 48 hours after I placedmy order. The upper was even cooler than advertised. It shot perfectly straight out of the box with both subsonic and supersonic ammo.The price was excellent especially when combined with the speed my upper was delivered with.. I will definitely do business with MAS Defense again. Was this review helpful to you?

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.300 Blackout March 25, 2014 : Warren W   I recently ordered a 10.5" 300 blackout upper with a YHM handguard. It was shipped promptly, and I would not hesitate to do business with MAS defense in the future. The price was right, the buildlooks great, it fits my Spikes lower well, and everything was top notch. Great job MAS defense, I will be doing more business with you in the future. Was this review helpful to you?

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Smelton November 16, 2013 : Steven M   You will not find better quality for a better price. Feel good when you make this purchase. This company does business like I do. Customer being satisfied is a must... The rifle or pistol no matter what you buy has worked for me flawless. Not one round has failed to fire... I have shot with suppressor and without. Great group... I own LWRC&POF rifles and I consider these rifles best of best.. Well after shooting these uppers from MAS I would say the MAS shoots and performs just as good.. I wish I could post my pic of the 100 yard group I have... A 1/2" group at 100 yards with a 10.5" pistol is unheard of. My LWRC shoots a 3/4". Call it how you see it.. Feel great about my purchase. Was this review helpful to you?

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Pumpone November 12, 2013 : Steven M   Great upper. Found myself shooting 1/2" group @ 100 yards using the SB15 brace and Subsonic Amax ammo. I also have the same upper in .223. Accuracy and Quality for sure. this will be the only place I look for my uppers.. Great people to deal with. Thanks Was this review helpful to you?

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Zman 1017 November 10, 2013 : jim z   Pretty impressed! Did a lot of research before I bought this upper for my 300 AAC Blackout Pistol build. I could not find a lot of reviews on you guys before I bought this but I thought for the pricedifference I'd take a chance. Well let me tell you......Wow, definately a sweet upper. Finish, fit and function. I could not be happier. Finished my build this morning and took it to the range. All I can say is job well done! I will definately keep you guys in mind for any future purchases. Thank you for the great service and fast shipping!!!!! Was this review helpful to you?