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

Current Lead Times in BUSINESS DAYS:

Parts (1-2) days. 

Barreled Uppers (1-3) days.

E-mails can take 24-48 hours to respond to at this time.

Orders CANNOT be cancelled once they reach the "processing" stage.

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STATE & 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 driver's license to confirm their identity. Once confirmed, customers will not have to resubmit on future orders. 

FEATURED PRODUCTS



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
MSRP: $150.00
Our Price: $139.99
SALE PRICE: $89.99
In Stock

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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
MSRP: $120.00
Our Price: $114.00
SALE PRICE: $69.99
In Stock

(12)
POLYMER80 9MM STRIPPED SLIDE GLOCK 19 FITMENT GEN 3 P80 PF940C BLACK NITRIDE - RMR OPTIC CUT - P80-PS9C-OCS-BN G17 STANDARD FULL SIZE POLYMER80 9MM STRIPPED SLIDE GLOCK 19 FITMENT GEN 3 P80 PF940C BLACK NITRIDE - RMR OPTIC CUT - P80-PS9C-OCS-BN
MSRP: $295.00
Our Price: $249.99
SALE PRICE: $179.99
In Stock

(1)
MAS DEFENSE 9MM COLD HAMMER FORGED STEEL BARREL - GLOCK 19 FITMENT - MELONITE NITRIDE MAS DEFENSE 9MM COLD HAMMER FORGED STEEL BARREL - GLOCK 19 FITMENT - MELONITE NITRIDE
MSRP: $130.00
Our Price: $109.99
SALE PRICE: $54.99
(Out of Stock)
(2)
POLYMER80 80% LARGE LOWER RECEIVER GLOCK 20/21 SF FITMENT P80-PF45-BLK - BLACK P80-BK45-BLK P80 UNFINISHED FRAME POLYMER80 80% LOWER FRAME LARGE G20SF / G21SF PF45 P80-BK45-BLK - BLACK
MSRP: $169.00
Our Price: $129.99
SALE PRICE: $84.99
In Stock

(12)
16" AR-10 .308 1x10 BALLISTIC ADVANTAGE TACTICAL GOVERNMENT MID-LENGTH GAS BARREL - MODERN BABL308003M DPMS GEN 1 16" AR-10 .308 1x10 BALLISTIC ADVANTAGE TACTICAL GOVERNMENT MID-LENGTH GAS BARREL - MODERN BABL308003M
MSRP: $230.00
Our Price: $218.50
In Stock

(23)
POLYMER80 FULL SIZE 9MM BARREL GLOCK 17 FITMENT MELONITE NITRIDE - P80-BRL-PFS9-BLK POLYMER80 FULL SIZE 9MM BARREL GLOCK 17 FITMENT MELONITE NITRIDE - P80-BRL-PFS9-BLK
MSRP: $150.00
Our Price: $119.99
SALE PRICE: $59.99
In Stock

(2)
POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19 FITMENT - BLACK - P80-PF940CV1-BLK GCA COMPLIANT 76% FRAME POLYMER80 80% LOWER FRAME COMPACT G19 / G23 PF940C P80-BKC-WHT - CERAKOTE WHITE
MSRP: $185.00
Our Price: $144.99
SALE PRICE: $99.99
(Out of Stock)
(1)
POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19 FITMENT - BLACK - P80-PF940CV1-BLK GCA COMPLIANT 76% FRAME POLYMER80 80% LOWER FRAME COMPACT G19 / G23 PF940C P80-BKC-BLK - BLACK
MSRP: $159.00
Our Price: $119.99
SALE PRICE: $79.99
In Stock

(354)
POLYMER80 COMPACT 9MM BARREL GLOCK 19 FITMENT MELONITE NITRIDE - P80-BRL-PFC9-BLK POLYMER80 COMPACT 9MM BARREL GLOCK 19 FITMENT MELONITE NITRIDE - P80-BRL-PFC9-BLK
MSRP: $150.00
Our Price: $119.99
SALE PRICE: $59.99
In Stock

(5)
POLYMER80 80% POLYMER SINGLE STACK LOWER RECEIVER BLACK - GLOCK 43 FITMENT- P80-PF9SS-BLK POLYMER80 80% LOWER FRAME SINGLE STACK G43 PF9SS P80-BKSS-BLK - BLACK
MSRP: $139.00
Our Price: $99.99
SALE PRICE: $74.99
In Stock

(17)
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
MSRP: $175.00
Our Price: $161.00
SALE PRICE: $129.99
In Stock

(6)
MAS DEFENSE 9MM COLD HAMMER FORGED STEEL BARREL - GLOCK 19 FITMENT - GOLD TiN MAS DEFENSE 9MM COLD HAMMER FORGED STEEL BARREL - GLOCK 19 FITMENT - GOLD TiN
MSRP: $140.00
Our Price: $119.99
SALE PRICE: $67.99
In Stock
POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19/23 FITMENT - FLAT DARK EARTH FDE - P80-PF940CV1-FDE POLYMER80 80% LOWER FRAME COMPACT G19 / G23 PF940C P80-BKC-FDE - FLAT DARK EARTH
MSRP: $159.00
Our Price: $119.99
SALE PRICE: $79.99
In Stock

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POLYMER80 PF-SERIES 9MM SLIDE PARTS KIT GLOCK FITMENT P80 BLACK / RED - P80-PFP-SKIT P80-PFP-SKIT-BLK-RED GLOCK 17 GLOCK 19 GLOCK 26 GLOCK 34 POLYMER80 PF-SERIES 9MM SLIDE PARTS KIT GLOCK FITMENT P80 BLACK / RED - P80-PFP-SKIT-BLK-RED
MSRP: $100.00
Our Price: $74.99
SALE PRICE: $54.99
In Stock

(1)
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
MSRP: $555.00
Our Price: $499.99
SALE PRICE: $391.99
In Stock

(4)
POLYMER80 80% LARGE LOWER RECEIVER GLOCK 20/21 SF FITMENT P80-PF45-FDE - FLAT DARK EARTH P80-BK45-FDE P80 UNFINISHED FRAME POLYMER80 80% LOWER FRAME LARGE G20SF / G21SF PF45 P80-BK45-FDE - FLAT DARK EARTH
MSRP: $169.00
Our Price: $129.99
SALE PRICE: $84.99
In Stock

(19)