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


local_shipping

SHIPPING LEAD TIMES

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 24-48 hours to respond to.

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LOCAL PICKUP

Due to the volume of orders processed, Local Pickup is no longer available. We apologize for the inconvenience.

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ORDERS

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.


receipt

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



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 W/ BCG & FCH
RETAIL: $575.00
Our Price: $509.99
SALE PRICE: $374.15
In Stock
(2)
SYLVAN ARMS 9MM GLOCK CONVERSION BLOCK - GCB100 SYLVAN ARMS 9MM CONVERSION BLOCK - GLOCK MAGS- GCB100
RETAIL: $125.00
Our Price: $115.99
SALE PRICE: $82.99
In Stock
(210)
SYLVAN ARMS GEN 3 AR-15 SIDE FOLDING STOCK ADAPTER - ARH300 ARH100 SYLVAN ARMS GEN 3 AR SIDE FOLDING STOCK ADAPTER - ARH300
RETAIL: $195.00
Our Price: $179.99
SALE PRICE: $124.99
In Stock
(396)
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: $54.99
In Stock
(5)
10.5" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 9" G2 STREAMLINE M-LOK RAIL UNASSEMBLED KIT 15A58C10NSQ FFHGMLOK9G215 10.5" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 9" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT
RETAIL: $438.00
Our Price: $399.99
SALE PRICE: $289.99
In Stock
10.5" 5.56 / .223 1x7 BALLISTIC ADVANTAGE GOVERNMENT PROFILE CARBINE LENGTH BARREL - MODERN BABL556005M 10.5" 5.56 / .223 AR-15 1x7 BALLISTIC ADVANTAGE GOVERNMENT PROFILE CARBINE LENGTH BARREL - MODERN BABL556005M
RETAIL: $140.00
Our Price: $133.00
SALE PRICE: $89.99
In Stock
(15)
16" 5.56 / .223 AR-15 1X8 FAXON FIREARMS GOVT / SOCOM PROFILE MID-LENGTH BARREL - 15A58M16NSQ 16" 5.56 / .223 AR-15 1X8 FAXON FIREARMS GOVT / SOCOM PROFILE MID-LENGTH BARREL - 15A58M16NSQ
RETAIL: $169.00
Our Price: $160.55
SALE PRICE: $119.97
In Stock
(3)
NORSSO TIGER CLAW 2.0 SLIDE FOR GLOCK 19 GEN 1-3 - N19-TC2-3 N19-TC2 NORSSO TIGER CLAW 2.0 SLIDE FOR GLOCK 19 GEN 1-3 - N19-TC2-3
RETAIL: $340.00
Our Price: $329.99
SALE PRICE: $289.12
In Stock
(2)
16" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 13" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT 15A58M16NSQ FFHGMLOK15G215 16" 5.56 AR-15 BARRELED UPPER KIT - FAXON FIREARMS 15" G2 STREAMLINE M-LOK RAIL - UNASSEMBLED KIT
RETAIL: $480.00
Our Price: $439.99
SALE PRICE: $309.99
In Stock
POLYMER80 AR15 RHINO RL556V3 80% POLYMER LOWER RECEIVER KITS - P80-RL556V3 - COLOR OPTIONS 5 PACK POLYMER80 AR15 RHINO 80% POLYMER LOWER RECEIVER KITS - P80-RL556V3 - COLOR OPTIONS
RETAIL: $450.00
Our Price: $399.95
SALE PRICE: $274.95
In Stock
(6)
8" 5.56 / .223 AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL556003M 8" 5.56 / .223 AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL556003M
RETAIL: $120.00
Our Price: $114.00
SALE PRICE: $79.99
In Stock
(3)
POLYMER80 AR15 RHINO RL556V3 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556v3-BLK POLYMER80 AR15 RHINO 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556V3-BLK
RETAIL: $90.00
Our Price: $79.99
SALE PRICE: $59.99
In Stock
(169)
POLYMER80 AR15 RHINO RL556V3 80% POLYMER LOWER RECEIVER KITS - P80-RL556V3 - COLOR OPTIONS 3 PACK POLYMER80 AR15 RHINO 80% POLYMER LOWER RECEIVER KITS - P80-RL556V3 - COLOR OPTIONS
RETAIL: $270.00
Our Price: $239.97
SALE PRICE: $173.97
In Stock
(4)
FIRE CONTROL GROUP - ENHANCED ELONGATED CUT (EEC) AR-15 / AR-10 MELONITE NITRIDE - TRIGGER HAMMER DISCONNECTOR FCG ​FIRE CONTROL GROUP - AR-15 / AR-10 MELONITE NITRIDE - ENHANCED ELONGATED CUT (EEC)
RETAIL: $30.00
Our Price: $24.99
SALE PRICE: $19.99
In Stock
(3)
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 -
RETAIL: $480.00
Our Price: $449.97
SALE PRICE: $292.50
In Stock
(9)
POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - PF940Cv1-BLK POLYMER80 80% POLYMER LOWER RECEIVER BLACK - GLOCK 19/23 FITMENT - P80-PF940CV1-BLK
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(167)
7.5" 5.56 / .223 AR-15 1X8 FAXON FIREARMS GOVT / SOCOM PROFILE PISTOL LENGTH BARREL - 15A58P7NSQ 7.5" 5.56 / .223 AR-15 1X8 FAXON FIREARMS GOVT / SOCOM PROFILE PISTOL LENGTH BARREL - 15A58P7NSQ
RETAIL: $155.00
Our Price: $147.25
SALE PRICE: $109.97
In Stock
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: $366.39
In Stock
(1)
10" 300 BLACKOUT AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL300006M 10" 300 BLACKOUT AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL300006M
RETAIL: $165.00
Our Price: $156.75
SALE PRICE: $94.99
In Stock
(5)
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: $470.00
Our Price: $429.99
SALE PRICE: $299.99
In Stock
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: $461.00
Our Price: $419.99
SALE PRICE: $289.99
In Stock