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16" Mel 1/9 M4 Upper w/ 10" SDX (TM) Rail
On Target With
Savings Of
$50.00
Original Price $299.99
Sale Price $249.99
Looking to build a tested battle rifle?

Hardened Arms 16" M4 is designed to deliver the performance and accuracy you demand. Used by police forces, private contractors and private citizens it is the go to AR15 rifle and pistol configuration. The sixteen inch barrel provides the best mix of ballistic performance, durability and weight savings and maneuverability for our countries infantry. Machined in house from machine gun rated 4150CMV barrel steel with Melonite coating that out performs military interior chrome coating specifications it will last most shooters a lifetime. Chambered in 5.56 NATO Hardened Arms LLC, barrels are stress relieved, air gauged and machined in house to give you the accuracy and reliability that you are looking for.

Whats Your Mission?

Whether you are going to war, patrolling the streets or looking to hit the range with friends the 10in. SDX rail will afford your unlimited configuration options. Full length M-LOK rails on all four sides means your vertical foregrip, back up iron sights, mounted flashlight, bipod or other accessory can easily be secured in any position. The handguard is attached to a steel barrel nut via 8x button, head hex screws for secure mounting and easy maintenance. A 16 inch barreled upper will allow you the ballistic velocity for accurate hits out to 500 yards while being light enough to carry all day long.

Worry free operating.

If there is on thing you should never doubt is the company behind the rifle you rely on. We are known for our customer service and strive to treat our customers like family. Our uppers fit all "mil-spec" lower receivers and  are designed to last a lifetime. We machine our parts in house so we can stake our name on every part that leaves our shop. When you buy from Hardened Arms your buying from the machine shop, so you get the highest quality parts, with no middle men, at prices that leaves most gun shops to shame.


16" 5.56mm M4 AR15 Upper Assembly Specifications:

  • 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 Stress Relieved Button Rifled Machined In House Barrel
  • Black Melonite QPQ Finish
  • 6-Groove, 1/9 twist button rifled barrel
  • Chambered in 5.56 NATO (will also fire .223 ammo)
  • 16" M4 Profile barrel with M4 Extension
  • .750" diameter at gas block
  • 1/2x28 threaded muzzle/barrel
  • Low profile Hardened Arms gas block
  • Barrel dimpled to secure and align gas block
  • Carbine length gas system
  • A2 flash hider
  • Jam nut (1/2-28)
  • Hardened Arms 10" Free Float SDX Rail

Fits any mil-spec AR15 lower receiver.
UPPER ASSEMBLY
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4150CMV Barrel Steel
Whether starting with our 4150CMV machine gun barrel steel or highly refined 416R stainless steel our barrels are a cut above the rest. Engineered for accuracy and durability they are double nitrogen stress relieved and sodium nitrate coated/melonited (raw stainless steel is polished with melonited extensions). Index pins that lock into the upper receiver are pinned into the barrel through the extension on melonited barrels meaning the extension will never come loose. Machined in house on state of the art CNC equipment we deliver a barrel with every spec carefully controlled for peak performance.
 
Rail Lock Free Float Handguard
Machining our handguards in house provides us the opportunity to integrate features not found on most rails in the industry. Our rail lock feature, is designed to dovetail around your upper reciever insexing to insure a perfectly aligned rail that extends over the end of the upper reciever enough to do away with the unsightly gap found on lesser quality rail to receiver match ups. Combined with 6061-T6 aluminum with class II type III, hard coat anodized finish to match our uppers, fit and finish are top notch. Hardened Arms has many rail styles to choose from that are both stylish and functional. Our handguard offerings include quad rails, reduced weight rails, ergonomic smooth rails, skinny competition rails and our innovative patented Lumashark(R) illuminated rail with high lumen lights built in. Hardened Arms rails come in a variety of lengths and choices to meet your mission specific needs. .
 
Attention to detail.
It's the attention to detail that sets Hardened Arms apart. Items such as our machined in house 'Jam Nut' ensure ease of changing muzzle devices and indexing flash hiders while being fully re-useable. Crush washers are a thing of the past as they are single use and can induce stress and cause problems if used improperly. Bull barrels use shims to time your muzzle device without adding to the diameter of the already rigid barrel.

Alignment dimples are also machined into your barrel at the same time the gas port is drilled to provide 100% accurate positioning of your gas block and to keep it securely in place in spite of recoil. We machine our gas blocks and adjustable gas blocks right here from 4150 US barrel steel to give you the strongest and most durable product possible..
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 and short barreled rifle restrictions. 20% restocking fees if you cancel anytime after you order or 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. Fits any mil-spec AR15 lower receiver.
 
515 Tucker Ave Friday Harbor, WA 98250 | sales@hardenedarms.com
Phone: 425-530-0837