Adams Arms Long Range Tactical Marksman 5.56 Piston Upper - 18" AR15 Sniper Barrel
The Adams Arms Long Range Designated Marksman Rifle DMR 5.56 Piston Upper. This is the clean and reliable piston sniper system upper you need for your next AR15 build. It utilizes a Low Profile Flash Hider, 15" Samson rail (available in choice of Keymod, M-LOK, or Evolution) 18" 416R Stainless Steel with Black Salt Bath Nitride SBN Premium 5.56 Barrel, and Rifle Length Adjustable Gas P Series Block low profile gas piston system. Adjustable gas block allow for soft recoil tuning or suppressor use.
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Monolithic Style Samson Evolution Keymod Rail with Upper Receiver for sight stability, free float and enhanced accuracy.
Upgraded Low Mass Bolt Carrier
Latest Adjustable Gas P-Series Gas Block
Rifle Length Gas
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M4 Feed Ramps AR-15 Upper
- 4 lbs 15 oz with bcg and charging handle
- Includes one 2" rail, one 4" rail
This is a complete upper which includes a low mass piston bolt carrier group and charging handle.
Specifications:
- 18" BARREL MPI Tested 416SS SBN Finish, 5.56MM
- All barrel sub-assemblies are properly headspaced.
- Guaranteed Sub-MOA and has a Lifetime Warranty
- M4 Feed Ramps
- .750 Rifle Length Gas System
- 1:7 Twist Nitrided for reduced wear and enhanced accuracy
Best "Bang for the Buck" choice in barrels on the market today! 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.
Our barrels are finished with a SBN 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.