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Adams Arms UA-18-R-EUL-COR-XLP-556 Long Range Competition AR15 18" Light COR Piston Upper AR-15
Adams Arms UA-18-R-EUL-COR-XLP-556 Long Range Competition AR15 18' Light COR Piston Upper AR-15

Adams Arms UA-18-R-EUL-COR-XLP-556 Long Range Competition AR15 18" Light COR Piston Upper AR-15

Part Number:UA-18-R-EUL-COR-XLP-556
On sale: $1,033.50
Retail Price:$1,224.95
You Save:$191.45(16%)
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Add QD Sling Swivel [+$8.95]



Adams Arms Long Range Competition Optics Ready COR 5.56 Piston Upper - 18" AR15 Sniper Barrel

The Adams Arms Long Range version of the COR 5.56 Piston Upper. This is the clean and reliable piston sniper system upper you need for your next AR15 build. It utilizes the VDI Jet Comp, 15" Samson rail, 18" Voodoo light contour barrel, and rifle length easily accessible XLP piston system. 

New Low Mass One Piece Bolt Carrier
7.5 Oz (21% Lighter)

  • VDI LifeCoat 18” Ultra Lite Rifle Length Match Grade Barrel (.750 Gas Seat)
  • This Match-Grade barrel is precision honed, creating a smooth round and straight hole
  • Chambered 5.56x45mm NATO (will also shoot .223)
  • 4150CMV
  • 1:8 Twist
  • VDI Jet Compensator
  • Samson Evolution Rail
  • Equipped with Hand Stop
  • 2 – 2” Rails
  • QD Mount
Designed with competition shooters, the new C.O.R. Upper is the optimal setup for competitive shooting and is ready to go right out of the box! (just add an optic)

This upper was designed with a comprehensive approach to create the lowest felt recoil pulse while maintaining ultimate accuracy and maneuverability.

The VDI Ultra-Lite Barrel runs extremely light and accurate. Our New Low Mass Carrier and Rifle Length System significantly reduces felt recoil, and the VDI Jet Comp virtually eliminates muzzle rise for follow up shots.

All Adams Arms products are made in the USA and come with a Life-Time Warranty. 
  • Monolithic Style Samson Evolution Rail with Upper Receiver for sight stability, free float and enhanced accuracy.
  • M4 Feed Ramps AR-15 Upper
  • 4 lbs 13 oz with all rails attached, bcg, hand stop, Jet comp and charging handle
  • Includes 1 moveable 2" side rail and 4" bottom rail plus QD sling swivel mount

This is a complete upper which includes a bolt carrier group and charging handle.


  • 18" Light Contour 5.56 AR-15 Barrel
  • Guaranteed Sub-MOA and has a Lifetime Warranty
  • M4 Feed Ramps
  • .750 Rifle Length Gas System
  • 1:8 Twist QPQ Melonite for reduced wear and enhanced accuracy
  • AR-15 Barrel is 4150 CrMo.

Best "Bang for the Buck" choice in barrels on the market today! Adams Arms has expanded its product line to now include a line of barrels. The barrel has been treated with our salt nitride Meloniting process making them more corrosive resistant and harder than hard chrome.  This newer technology results in a longer lasting, more resistant, and more accurate barrel that produces higher ballistic velocities than a similar chrome lined barrel. These barrels have proven to OUTPERFORM any mil-spec barrel on the market and come with a LIFETIME WARRANTY.

Current Barrels Disadvantages:

Standard chrome lined barrels are rifled with a slightly larger diameter than what is needed. This is done so the hard chrome can be added on top of the surface area which will add to the tolerances. It leaves high and low spots along with microscopic divots and deficits. These imperfections add resistance to the round as it travels down the barrel, slowing down the velocity. Accuracy and range of efficiency drops when the velocities on the round drop. This is evident even more so with the shorter barrels. The trade off is hard chrome resists corrosion better than the bare material the barrel is cut from and it does not have a high cost associated with it. While eventually over time it will wear off, hard chrome will outlast bare metal. You sacrifice accuracy for longevity.

Stainless steel barrels are well known for higher velocities and better accuracy because the bore has been cut true into the steel. This cut does not leave any added imperfections so the round has less resistance as it travels down the barrel. This quality does come at a high price. Most stainless steel barrels cost almost twice what a chrome lined barrel cost, which prices them out of the market for most shooters. Also, while they have corrosive resistant properties by nature, they are not completely corrosive resistant and can corrode over time. They are the choice for most high end manufacturers and shooters but they are not a viable option for every shooter.

Adams Arms Advantage:

Our barrels are finished with our proprietary QPQ Melonite process inside and out. Unlike hard chrome and magnesium phosphate, Melonite is a molecular bonding process with the metal. It allows the chemicals to seep down below the surface area of the metal, instead of just adding a top layer. This means that the barrel can be cut to a true rifle bore while maintaining complete corrosion resistance and virtually no wear. It also means that the protection offered is not just a thin layer on top of the material but actually penetrates layers deep ensuring that it does not wear off. Now you have the velocities of a stainless steel true rifle bore with complete protection! You can out last a chrome lined barrel and shoot with the accuracy and efficiency of a stainless steel barrel, all without breaking the bank. Check out velocity testing below.

The SBR velocity data especially stands out. The 7.5" PDW AR is a now viable option for personal and professional defense as well as military units that need a short CQB rifle with an effective range well past 100 meters. We have been getting even higher velocities out of our 11.5" and 14.5" barrels, with the 14.5" averaging close to 3000 fps using military ammo. Our 16" barrels are getting velocities very close to a standard 20" chrome lined AR15 barrel!

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