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 (1-3) BUSINESS days. Barreled Uppers ship in approximately (2-4) 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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SATE & 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



80 PERCENT ARMS GST-9 MOD1 80% LOWER RECEIVER G19 G19X G19L G17 - 38019-BLK GLOCK GST9 80% ARMS 80% ARMS GST-9 MOD1 80% LOWER RECEIVER G19 G19X G19L G17 - 38019-BLK
MSRP: $150.00
Our Price: $139.99
SALE PRICE: $124.99
(Out of Stock)
80% ARMS GST-9 MOD1 FULL SIZE GRIP G17 - 380005-BLK 80% ARMS GST-9 MOD1 FULL SIZE GRIP G17 - 380005-BLK
MSRP: $23.00
Our Price: $19.99
SALE PRICE: $17.99
(Out of Stock)
POLYMER80 9MM STRIPPED SLIDE GLOCK 17 FITMENT GEN 3 P80 PF940V2 BLACK NITRIDE - P80-PS9-STD-BN G17 STANDARD FULL SIZE POLYMER80 9MM STRIPPED SLIDE GLOCK 17 FITMENT GEN 3 P80 PF940V2 BLACK NITRIDE - P80-PS9-STD-BN
MSRP: $275.00
Our Price: $224.99
SALE PRICE: $144.99
In Stock
18" .223 WYLDE 1x8 BALLISTIC ADVANTAGE SPR RIFLE LENGTH BARREL W/ OPS 12 - PREMIUM SERIES BABL223021P 18" .223 WYLDE AR-15 1x8 BALLISTIC ADVANTAGE SPR W/ OPS 12 STAINLESS STEEL RIFLE LENGTH BARREL - PREMIUM BABL223021P
MSRP: $210.00
Our Price: $199.50
SALE PRICE: $119.99
In Stock

(7)
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
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
MSRP: $140.00
Our Price: $133.00
SALE PRICE: $84.99
In Stock

(15)
SB TACTICAL SBA4 PISTOL STABILIZING BRACE 5-POSITION - SBA4-01-SB SBA4X-01-SB SB TACTICAL SBA4 ADJUSTABLE AR-15 PISTOL STABILIZING BRACE - BLACK - SBA4X-01-SB
MSRP: $125.00
Our Price: $99.99
SALE PRICE: $79.99
In Stock

(69)
POLYMER80 9MM GEN3 GLOCK FITMENT FRAME PARTS KIT W/ P80 COMPLETE TRIGGER ASSEMBLY P80-PFP-FKIT-BLK - BLACK LPK LOWER PARTS KIT GLOCK 17 GLOCK 19 GLOCK 26 GLOCK 34 POLYMER80 PF-SERIES 9MM GLOCK FITMENT FRAME PARTS KIT W/ P80 COMPLETE TRIGGER ASSEMBLY P80-PFP-FKIT-BLK - BLACK
MSRP: $60.00
Our Price: $49.99
SALE PRICE: $42.99
In Stock

(53)
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
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
In Stock
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

(4)
SB TACTICAL SBA3X 5-POSITION ADJUSTABLE PISTOL STABILIZING BRACE BLACK - SBA3X-01-SB SBA3-01-SB SB TACTICAL SBA3 ADJUSTABLE AR-15 PISTOL STABILIZING BRACE - BLACK - SBA3X-01-SB
MSRP: $125.00
Our Price: $99.99
SALE PRICE: $79.99
In Stock

(77)
POLYMER80 80% POLYMER LOWER RECEIVER GLOCK 19 FITMENT - BLACK - P80-PF940CV1-BLK POLYMER80 80% LOWER RECEIVER COMPACT G19 / G23 PF940C P80-BKC-BLK - BLACK
MSRP: $150.00
Our Price: $109.99
SALE PRICE: $64.99
(Out of Stock)
(320)
POLYMER80 MCK MICRO RONI CONVERSION KIT STABILIZER BRACE FOR P80 GLOCK STYLE FRAMES BLACK - STK-00229-BLK ARM BRACE PF940C PF940v2 PFC9 PFS9 BKC BKS 80% 80 PERCENT POLYMER 80 POLYMER80 MCK MICRO RONI CONVERSION KIT STABILIZER BRACE FOR P80 GLOCK STYLE FRAMES BLACK - STK-00229-BLK
MSRP: $285.00
Our Price: $264.99
SALE PRICE: $99.99
(Out of Stock)
(1)
80 PERCENT ARMS GST-9 MOD1 80% LOWER RECEIVER G19 G19X G19L G17 - 38019-FDE GLOCK GST9 80% ARMS 80% ARMS GST-9 MOD1 80% LOWER RECEIVER G19 G19X G19L G17 - 38019-FDE
MSRP: $150.00
Our Price: $139.99
SALE PRICE: $124.99
(Out of Stock)
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
80% ARMS GST-9 MOD1 FULL SIZE GRIP G17 - 380005-FDE 80% ARMS GST-9 MOD1 FULL SIZE GRIP G17 - 380005-FDE
MSRP: $23.00
Our Price: $19.99
SALE PRICE: $17.99
(Out of Stock)
POLYMER80 RECOVER TACTICAL 20/80 STABILIZER BRACE FOR P80 GLOCK STYLE FRAMES - P80-20-80-BASIC ARM BRACE POLYMER80 RECOVER TACTICAL 20/80 STABILIZER BRACE FOR P80 GLOCK STYLE FRAMES - P80-20-80-BASIC
MSRP: $100.00
Our Price: $89.99
SALE PRICE: $49.99
(Out of Stock)
(3)
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

(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

(3)
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

(11)
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

(9)
POLYMER80 GLOCK 17 80% POLYMER LOWER RECEIVER BLACK -PF940v2-BLK POLYMER80 80% LOWER RECEIVER FULL SIZE G17 / G22 PF940V2 P80-BKS-BLK - BLACK
MSRP: $150.00
Our Price: $109.99
SALE PRICE: $59.99
(Out of Stock)
(112)