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 (1-3) BUSINESS days. Barreled Uppers ship in approximately (2-4) BUSINESS days. Due to the high volume of orders, we can not, cancel, modify, edit or combine orders after they are placed. E-mails can take up to 3 days 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



POLYMER80 AR15 RHINO RL556V3 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556v3-BLK 5 PACK POLYMER80 AR15 RHINO 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556V3-BLK
RETAIL: $450.00
Our Price: $399.95
SALE PRICE: $274.95
In Stock
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: $64.99
In Stock
(144)
POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - PF940Cv1-BLK 5 PACK POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - P80-PF940CV1-BLK
RETAIL: $800.00
Our Price: $749.95
SALE PRICE: $474.95
In Stock
(5)
9" 300 Blackout Ballistic Advantage DRP Profile Pistol Length AR-15 Barrel - Modern Series - BABL300004M 9" 300 BLACKOUT AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL300004M
RETAIL: $160.00
Our Price: $152.99
In Stock
POLYMER80 GLOCK 17/22 80% POLYMER LOWER RECEIVER OD GREEN - PF940V2-ODG POLYMER80 GLOCK 17/22 80% POLYMER LOWER RECEIVER OD GREEN - P80-PF940V2-ODG
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(18)
POLYMER80 GLOCK 19 80% POLYMER LOWER RECEIVER GRAY - PF940Cv1-GRY POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER GRAY - P80-PF940CV1-GRY
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(27)
SYLVAN ARMS 9MM GLOCK CONVERSION BLOCK - GCB100 SYLVAN ARMS 9MM GLOCK CONVERSION BLOCK - GCB100
RETAIL: $125.00
Our Price: $115.99
SALE PRICE: $94.99
In Stock
(199)
POLYMER80 GLOCK 17 80% POLYMER LOWER RECEIVER GRAY - PF940V2-GRY POLYMER80 GLOCK 17/22 80% POLYMER LOWER RECEIVER GRAY - P80-PF940V2-GRY
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(22)
POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - PF940Cv1-BLK POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - P80-PF940CV1-BLK
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(146)
POLYMER80 GLOCK 17 80% POLYMER LOWER RECEIVER FLAT DARK EARTH - PF940v2-FDE POLYMER80 GLOCK 17/22 80% POLYMER LOWER RECEIVER - FLAT DARK EARTH - P80-PF940V2-FDE
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(27)
16" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 15" M-LOK RAIL - MID LENGTH GAS 16" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE GROUNDWORKS 15" M-LOK RAIL - MID LENGTH W/ BCG & FCH
RETAIL: $585.00
Our Price: $519.99
SALE PRICE: $419.99
In Stock
(16)
POLYMER80 GLOCK 17 80% POLYMER LOWER RECEIVER BLACK -PF940v2-BLK POLYMER80 GLOCK 17/22 80% POLYMER LOWER RECEIVER BLACK - P80-PF940V2-BLK
RETAIL: $160.00
Our Price: $149.99
SALE PRICE: $99.99
In Stock
(53)
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: $399.99
In Stock
(2)
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: $399.99
In Stock
(1)
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
In Stock
(1)
16" .300 Blackout Ballistic Advantage DRP Profile Pistol Length AR-15 Barrel - Modern Series - BABL300011M 16" 300 BLACKOUT AR-15 1x7 BALLISTIC ADVANTAGE DRP PROFILE PISTOL LENGTH BARREL - MODERN BABL300011M
RETAIL: $180.00
Our Price: $171.99
In Stock
(8)
NORSSO TIGER CLAW SLIDE 2.0 FOR GLOCK 17 GEN 1-3 WITH RMR OPTIC CUT - N17-TC-RMR-3 NORSSO TIGER CLAW 2.0 SLIDE FOR GLOCK 17 GEN 1-3 - N17-TC2-3
RETAIL: $340.00
Our Price: $329.99
In Stock
10.5" 5.56 / .223 1x7 GOVT PROFILE 4150 CrMoV BARREL 10.5" 5.56 / .223 1x7 GOVT PROFILE 4150 CrMoV MAGNESIUM PHOSPHATE BARREL
RETAIL: $140.00
Our Price: $124.99
SALE PRICE: $114.99
In Stock
(2)
SYLVAN ARMS GEN 3 AR-15 SIDE FOLDING STOCK ADAPTER - ARH300 ARH100 SYLVAN ARMS GEN 3 AR SIDE FOLDING STOCK ADAPTER - ARH300
RETAIL: $200.00
Our Price: $179.99
SALE PRICE: $144.99
In Stock
(387)
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
In Stock
(5)
AR15 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT MELONITE NITRIDE BCG AR15 BOLT CARRIER GROUP 5.56 & 300 BLACKOUT BCG - MELONITE NITRIDE
RETAIL: $150.00
Our Price: $139.99
SALE PRICE: $109.99
In Stock
(101)
POLYMER80 AR15 RHINO RL556V3 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556v3-BLK 3 PACK POLYMER80 AR15 RHINO 80% POLYMER LOWER RECEIVER KIT BLACK - P80-RL556V3-BLK
RETAIL: $270.00
Our Price: $239.97
SALE PRICE: $179.97
In Stock
(2)
MAS DEFENSE AR15 SLICK SIDE UPPER RECEIVER MAS DEFENSE AR-15 FORGED UPPER RECEIVER - SLICK SIDE
RETAIL: $75.00
Our Price: $64.99
In Stock
(162)
POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - PF940Cv1-BLK 3 PACK POLYMER80 GLOCK 19/23 80% POLYMER LOWER RECEIVER BLACK - P80-PF940CV1-BLK
RETAIL: $480.00
Our Price: $449.97
SALE PRICE: $292.50
In Stock
(5)