Welcome.

SALES-SPECIALS
BARRELED UPPERS
UPPER PARTS
LOWER PARTS


WELCOME TO OUR STORE!

MAS Defense is committed to providing "Quality Parts at Reasonable Prices!" Our foundation is built on excellent customer service, honesty and integrity. These simple guidelines are what has made MAS Defense the preferred company it is today.

Thank you for your business and support!
Team MAS Defense


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SHIPPING

Parts ship in approximately (2-4) BUSINESS days. Barreled Uppers ship in approximately (3-5) BUSINESS days. Due to the high volume of orders, we cannot cancel, modify, edit or combine orders after they are placed. E-mails can take 24-72 hours to respond to.

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80% LOWERS &

AGE RESTRICTIONS

Please click HERE for updated information.

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INVENTORY

All of our inventory is LIVE DATA. If a part shows in stock, we have it in stock. We do not "Back Order" parts. Barreled Upper Orders can not be changed or modified in any way after they have been placed. Please contact us BEFORE  you place an order with any questions.


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FRAUD POLICY

Due to increased fraudulent activity, customers with different billing and shipping addresses or credit card names will be required to submit a copy of their drivers license to confirm their identity. Once confirmed, customers will not have to resubmit on future orders. 

FEATURED PRODUCTS



10.5" 5.56 / .223 1x7 GOVT PROFILE 4150 CrMoV MELONITE NITRIDE BARREL 10.5" 5.56 / .223 1x7 GOVT PROFILE 4150 CrMoV MELONITE NITRIDE BARREL
RETAIL: $135.00
Our Price: $124.99
SALE PRICE: $79.99
In Stock
(33)
3 PACK 80% BILLET LOWER RECEIVER - AR-15 80 PERCENT 80 % AR15 AR 15 GHOST GUN 80 PERCENT 3 PACK 80% BILLET LOWER RECEIVER AR-15 - BLACK
RETAIL: $375.00
Our Price: $299.97
SALE PRICE: $249.97
In Stock
(1)
16" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 13" M-LOK RAIL - MID LENGTH GAS 16" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 13" M-LOK RAIL - MID LENGTH GAS W/ BCG & FCH
RETAIL: $575.00
Our Price: $509.99
SALE PRICE: $399.99
In Stock
(4)
16" 5.56 / .223 1x7 GOVERNMENT 4150 CrMoV MELONITE NITRIDE BARREL - MID-LENGTH GAS 16" 5.56 / .223 1x7 GOVERNMENT 4150 CrMoV MELONITE NITRIDE BARREL - MID-LENGTH GAS
RETAIL: $150.00
Our Price: $139.99
SALE PRICE: $89.99
In Stock
(10)
80% FORGED LOWER RECEIVER - AR-15 80 PERCENT 80 % AR15 AR 15 LET'S GO BRANDON 80% FORGED LOWER RECEIVER AR-15 - LET'S GO BRANDON
RETAIL: $95.00
Our Price: $74.99
SALE PRICE: $62.99
In Stock
(24)
7.5" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 9" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT 15A58P7NSQ FFHGMLOK9G215 7.5" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 9" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT
RETAIL: $425.00
Our Price: $387.99
SALE PRICE: $337.99
In Stock
80% BILLET LOWER RECEIVER - AR-15 80 PERCENT 80 % AR15 AR 15 80% BILLET LOWER RECEIVER AR-15 - BLACK
RETAIL: $125.00
Our Price: $99.99
SALE PRICE: $89.99
In Stock
(5)
5D TACTICAL AR-15 / AR-9 PRO UNIVERSAL 80% LOWER RECEIVER ROUTER JIG - 5D-JIG15 5D TACTICAL AR-15 / AR-9 PRO UNIVERSAL 80% LOWER RECEIVER ROUTER JIG - 5D-JIG15
RETAIL: $220.00
Our Price: $199.99
(Out of Stock)
(16)
3 PACK POLYMER80 80% POLYMER LOWER RECEIVER - P80-PF940CV1 - GLOCK 19/23 3 PACK POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19/23 FITMENT P80-PF940CV1 - COLOR OPTIONS
RETAIL: $480.00
Our Price: $419.97
SALE PRICE: $344.97
In Stock
(19)
POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19 FITMENT - BLACK - P80-PF940CV1-BLK POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19/23 FITMENT P80-PF940CV1-BLK - BLACK
RETAIL: $160.00
Our Price: $139.99
SALE PRICE: $119.99
In Stock
(228)
5D TACTICAL AR-10 .308 DPMS GEN 1 BILLET 80% LOWER RECEIVER BLACK - 10038-BLK 5D TACTICAL AR-10 .308 DPMS GEN 1 BILLET 80% LOWER RECEIVER BLACK - 10038-BLK
RETAIL: $130.00
Our Price: $109.99
In Stock
(6)
3 PACK 80% FORGED LOWER RECEIVER - AR-15 80 PERCENT 80 % AR15 AR 15 GHOST GUN 3 PACK 80% FORGED LOWER RECEIVER AR-15 - ANODIZED BLACK
RETAIL: $270.00
Our Price: $209.97
SALE PRICE: $160.97
In Stock
(12)
3 PACK POLYMER80 80% POLYMER LOWER RECEIVER - P80-PF940V2 - GLOCK 17/22 3 PACK POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 17/22 FITMENT P80-PF940V2 - COLOR OPTIONS
RETAIL: $480.00
Our Price: $419.97
SALE PRICE: $344.97
In Stock
(9)
POLYMER80 GLOCK 17 80% POLYMER LOWER RECEIVER BLACK -PF940v2-BLK POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 17/22 FITMENT P80-PF940V2-BLK - BLACK
RETAIL: $160.00
Our Price: $139.99
SALE PRICE: $119.99
In Stock
(83)
11.5" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 9.875" M-LOK RAIL - CARBINE GAS 11.5" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 9.875" M-LOK RAIL - CARBINE GAS W/ BCG & FCH
RETAIL: $555.00
Our Price: $499.99
SALE PRICE: $391.99
In Stock
(2)
80% FORGED LOWER RECEIVER - AR-15 80 PERCENT 80 % AR15 AR 15 80% FORGED LOWER RECEIVER AR-15 - ANODIZED BLACK
RETAIL: $90.00
Our Price: $69.99
SALE PRICE: $58.65
In Stock
(375)
16" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 13" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT 15A58M16NSQ FFHGMLOK13G215 16" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 13" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT
RETAIL: $435.00
Our Price: $393.99
SALE PRICE: $343.99
In Stock
POLYMER80 AR-15 RHINO 80% POLYMER LOWER RECEIVER KIT - FLAT DARK EARTH FDE - P80-RL556V3-FDE POLYMER80 AR-15 RHINO 80% POLYMER LOWER RECEIVER KIT P80-RL556V3-FDE - FLAT DARK EARTH
RETAIL: $90.00
Our Price: $79.99
SALE PRICE: $69.99
In Stock
(64)
16" 5.56 / .223 1x8 M4 AR-15 CONTOUR 4140 CrMoV MELONITE NITRIDE BARREL 16" 5.56 / .223 1x8 M4 CONTOUR 4140 CrMoV MELONITE NITRIDE BARREL
RETAIL: $150.00
Our Price: $139.99
SALE PRICE: $89.99
In Stock
(13)