18" 5.56 / .223 BARRELED UPPER - MAS 15" SLIM M-LOK - PREMIUM
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Upper Receiver
MAS A4 Upper Receiver
M4 Feed Ramps
Black Hardcoat Anodized Mil-Std-171 Type III
Precision Machined to Mil-Spec Tolerances
Forged From High-Grade 7075 T6 Aluminum
Mil-Spec Forward Assist and Ejection Door

Barrel
18" .223 Wylde (Can fire 5.56) Premium Barrel
Lightweight Govt Profile
416R Stainless Steel
Heat Treated to ~32RC Hardness
1x8 Twist - M4 Ramps
Rifle Length Gas System
.750 Gas Block Area
Threaded 1/2 x 28

Gas System
Rifle Length Stainless Steel Gas Tube
.750 Low Profile Steel Melonite Gas Block

Hand Guard
MAS Defense 15" Slim Line M-LOK
M-LOK Attachments located at the 3, 6 and 9 o'clock position
Quick Detach mounts at front and rear
Weight: 13.4oz including steel barrel nut
Made in USA

Muzzle Brake
A2 Half Cage
*A different muzzle device can be selected from the drop down menu above.


The Bolt Carrier Group and Charging Handle are not included. Please see "Related Items"
below or go to our Bolt Carrier Group and Charging Handle Section to choose one.

All barreled uppers are head spaced and test fired to ensure function.

ALL LAWS APPLY. IT IS THE RESPONSIBILITY OF THE BUYER TO UNDERSTAND ALL
LAWS REGARDING PURCHASE AND OWNERSHIP OF THIS UPPER. WE STRONGLY
URGE YOU TO CONTACT YOUR LOCAL FFL AND/OR THE ATF WITH ANY AND ALL
QUESTIONS TO MAKE SURE YOU UNDERSTAND THE LAW BEFORE PURCHASING
THIS ITEM.
  • Item #: 182W8MAS15BU
  • Condition: New

18" 5.56 / .223 BARRELED UPPER - MAS 15" SLIM M-LOK - PREMIUM

Price: $459.99
Sale Price: $299.99
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Availability: In-Stock
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