Looking for something compact, deadly accurate and small in the hand? Hardened Arms is pleased to bring you our first slim line style 10" SDX Mk II Slim Line MLok Rail. Featuring M-Lok attachment points at 3, 6 and 9 with a full length top rail you will love the new rail style. Matched with our 10.5" 4150CMV 300blk barrels machined in house this deal won't last long!
Complete AR15 SDX Mk II Upper Receiver Assembly:
Hardened Arms M4 Feed Ramp Flat Top Receiver
Black anodized mil-spec finished upper receiver
Feed ramps for increased feeding reliability on barrel and upper
Laser etched T-Marked upper receiver
4150CMV .300 Blackout High End Barrel
Black Melonited/QPQ Finish
Stress Relieved for superior accuracy
Chambered in .300 Blackout
10.5" HBAR Profile barrel with M4 Extension
.750" barrel diameter at gas block
5/8x24 threaded muzzle/barrel
Low profile gas block
Barrel dimpled to secure gas block
Pistol length gas system
A2 flash hider
10" SDX Mark II Slim Line MLok Rail (1.46" Cross Section, 1.3" Inner Diameter)
Fits any mil-spec AR15 lower receiver.
Hardened Arms uppers are high end, accurate, head spaced, inspected and test fired prior to shipping. They are built using stringent specs, top quality parts and procedures to ensure maximum reliability and performance.
You are responsible for knowing your state laws regarding barrel lengths, pistol, Short barreled rife restrictions. 20% restocking fees if you can not take delivery due to state restriction. Dealer programs are available on our website. Two year warranty against manufacturer defects. Finishes will wear with use, no warranties apply to finish wear.