NEMO XO Steel 308 12.7 inch

The NEMO XO Steel 308 in the 12.7 inch configuration is NEMO Arms’ newest Executive Order, an AR-10 built around the company’s all new 48 position adjustable gas block and a slim full length 12 inch M-LOK handguard. It is ultra compact and lightweight, available in both pistol and short barreled rifle configurations. A matched billet receiver set and a match grade Bartlein 12.7 inch barrel handle the accuracy side of the equation. This is a serious .308 in a package most people would expect from a carbine.

What Makes the NEMO XO Steel Different

Big bore ARs usually come with a penalty in weight and recoil, and that is where this rifle separates itself. Both the pistol and SBR versions feature NEMO Arms’ patented recoil reduction system, which uses a spring loaded buffer integrated into the rear of the bolt carrier alongside a standard AR-10 buffer.

Those two buffers work in unison to greatly reduce felt recoil, making follow up shots painless and quick with real accuracy. On a short barreled .308 that is not a small thing, since short gas systems and heavy bolt carriers normally make for a harsh shooting experience.

Features of This AR-10 Platform

The NEMO XO Steel specification list reflects a rifle built for performance rather than a price point.

• 48 position adjustable gas block for fine tuning the gas system to load and suppressor
• Match grade Bartlein 12.7 inch barrel for excellent accuracy in a short package
• Matched billet receiver set for tight tolerances between upper and lower
• Slim full length 12 inch M-LOK handguard for accessory mounting and a comfortable hold
• Patented recoil reduction system with a spring loaded buffer in the rear of the bolt carrier
• Available in pistol or short barreled rifle configuration

Specifications and Why They Matter

The 48 position adjustable gas block is the standout specification. Most adjustable blocks offer a handful of settings, and 48 positions gives you the resolution to tune gas precisely for a specific load, a specific buffer weight, or a suppressor. That level of adjustment is what makes a short gas system civilized.

Bartlein is one of the most respected barrel makers in American precision shooting, and finding a match grade Bartlein barrel on a factory rifle tells you where the money went. At 12.7 inches you give up velocity compared with a 16 or 18 inch tube, but you gain a rifle that maneuvers like a pistol caliber carbine.

The M-LOK handguard runs the full 12 inches, giving a nearly complete rail for lights, lasers, bipods, and hand stops. Compare this rifle against the rest of our inventory in the firearms collection.

Practical Use, Tuning, and Care

Tune the gas block before doing anything else. Start with enough gas to lock the bolt back reliably with your chosen ammunition, then back it down until you find the setting that cycles cleanly without over gassing. Repeat the process for suppressed use, since a can dramatically increases back pressure.

Clean the bolt carrier group regularly and pay attention to the integrated recoil reduction components. Any system with moving parts inside the carrier needs the carbon kept in check, and neglect eventually shows up as inconsistent cycling.

Feed it quality .308 ammunition and keep a log of what shoots well. A match grade barrel rewards good ammunition and shows you clearly when a load is not up to standard, which is exactly the feedback a precision shooter wants.

Understand the configuration rules that apply where you live before ordering the NEMO XO Steel 308, since pistol and short barreled rifle setups carry different requirements from state to state.

Light, compact, accurate, and far softer shooting than a short .308 has any right to be. Like every firearm, it ships to your local licensed dealer for transfer after your background check.