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18" 5.56 Socom Melonited 1/7 AR15 Upper w/ 12" HD Quad Rail
On Target With
Savings Of
Original Price $319.99
Sale Price $249.99
Is the 18" barrel the best all around 5.56 performer?

While the 16 inch barreled uppers get all the attention these days the 18 inch upper is one of the best kept secrets of the AR15 rifle world. The extra length provides not only more velocity to the projectile headed down range but also more stability. Often times used for competition shooting this upper uses the extra barrel length of the 18" socom profile to step up to a mid-length gas system. The longer gas system reduces gas impulse while maintaining dwell time of the round in the bore giving a reliable but smooth recoiling feel to the rifle. Often times paired with an optional muzzle brake these uppers can provide some of the fastest follow up shots the AR has to offer while allowing flatter shooting at medium ranges. The profile of the 18" barrel is cut to a .750" profile under the handguard and in front of the gas block for reduced weight.

Why should I run a Hardened Arms quad rail?

Hardened Arms machines our quad rails in house from American 6061-T6 extrusions. This quad rail is free floated from the barrel providing better accuracy and no influence/pressure on the barrel. The handguard is attached directly to the barrel nut that holds the barrel in the receiver with 8x hex head button screws for secure mounting and easy maintenance. At 12 inches the vented handguard covers the gas system entirely and is machined to allow the addition of an endcap flush with the end as an upgrade. The full length picatinny rails allow attachment of many accessories at the 3, 6, 9 or 12 position from a bipod underneath to targeting lasers
compatible with 1913 picatinny rails.

18" 5.56mm AR-15 Upper Receiver Assembly:
  •     Hardened Arms M4 Feed Ramp Flat Top Receiver
  •     Mil-spec 7075 Upper 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 Mil-Spec-B Steel Melonited Barrel
  •     Chambered in 5.56mm (will also shoot .223)
  •     18" Socom Profile barrel with M4 Extension
  •     1/7 Barrel Twist
  •     .750" diameter at gas block
  •     1/2x28 threaded muzzle/barrel
  •     Low profile gas block
  •     Barrel dimpled to secure gas block
  •     Mid-Length gas system
  •     A2 flash hider
  •     12" Hardened Arms Quad Rail Hand guard (end cap available as an upgrade)

Fits any mil-spec AR15 lower receiver.

515 Tucker Ave Friday Harbor, WA 98250 |
Phone: 425-530-0837