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16" 5.56 SS Bull Barrel 1/7 10" HD Quad Upper
On Target With
Savings Of
Original Price $299.99
Sale Price $259.99
This product is not available for purchase.
Want uncompromising performance from a 16in upper?

Hardened Arms is delivering un-paralled accuracy and performance with our 16in 416R stainless steel bull barrels. The added mass of the bull barrel profile gives you a rigid platform and the 416R alloy further increases accuracy potential through reduced harmonics. Combined with a nitrogren stress relieve process cold bore shots will have the same impact point as the last shot in a string of fire. The 1/7 twist rate of this barrel will favor heavier 5.56/.223 bullets with the faster twist rate providing more bullet stability during flight.

Match shooter, Sharp shooter or Varmint hunter?

The challenge of medium range shooting and small game hunting is what has driven 5.56mm bull barrels in 16inch lengths to be perfected. Paired with match ammo the groupings are impressive to say the least from this upper. The improved harmonics of 416R over 4150CMV allows for a more repeatable exit trajectory of the projectile. The added weight will aid in keeping the rifle planted so you can see the bullets impact and adjust for the follow up shot. Threaded with a 1/2-28 thread allows the use of a muzzle brake, suppressor or other muzzle devices. Comes with a stainless bull barrel thread protector to keep your barrel safe in transport.

Want to run a bipod, sling or backup sights?

The 10" Hardened Arms quad rail installed on this upper has 1913 picatinny rails running the full length of the rail on all four sides lets you do it all. A picatinny bipod will give you the stability for precision shooting and will mount directly to the rail on the bottom. If your looking for even more stability consider upgrading to a longer rail that will move the bipod further out and give you a longer support "base".

16" SS Bull Barrel AR15 Upper 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
  •     416R Stainless Steel 5.56mm Barrel
  •     Air-Gauged, Inspected and head spaced
  •     Nitrogen stress relieved
  •     Chambered in 5.56mm (Will also shoot .223)
  •     16" Bull Profile barrel with M4 Extension
  •     1/7 Barrel twist
  •     .936" barrel diameter at gas block
  •     1/2x28 threaded muzzle/barrel
  •     Low profile bull barrel gas block
  •     Barrel dimpled to secure gas block
  •     Carbine-Length gas system
  •     Stainless steel thread protector
  •     10" Hardened Arms Free Float Quad Rail (endcap available as upgrade)

Fits any mil-spec AR15 lower receiver.
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 |
Phone: 425-530-0837