The LWRC ICMKII SBR (brand part no. ICMKIIR5PBC12S) is a 5.56mm short-barrel rifle built around LWRC’s patented short-stroke gas piston system, giving shooters a compact, reliable platform finished in Patriot Brown. LWRC forges its Monoforge one-piece upper receiver for added strength over a standard-pattern upper, and coins every forging (struck twice in the die) for precise dimensional accuracy and a superior surface finish. A Black Nitride-treated, cold-hammer-forged barrel with a 1:7 twist stabilizes a wide range of 5.56mm bullet weights, and a Nickel-Boron-coated bolt carrier adds wear resistance, corrosion resistance, and lasting lubricity. Fully ambidextrous lower-receiver controls, including the bolt catch/release, magazine release, and safety selector, round out the design, backed by LWRCI Skirmish back-up iron sights and an A5 2-position gas block. Among short-barrel semi-auto rifles, this ICMKII SBR favors experienced NFA buyers who want a compact, gas-piston-driven 5.56mm platform.

Key Specifications

• The chambering is 5.56mm.
• The barrel measures 12 inches, cold hammer forged with a 1:7 twist.
• Runs LWRC’s patented short-stroke gas piston operating system.
• The barrel is Black Nitride treated for wear and corrosion resistance.
• The bolt carrier is Nickel-Boron coated.
• The upper receiver is a Monoforge one-piece, coined forging.
• The controls are fully ambidextrous.
• Equipped with LWRCI Skirmish back-up iron sights and an A5 2-position gas block.
• Finished in Patriot Brown.
• Includes a 30-round Magpul PMAG.

Frequently Asked Questions

Is this an NFA item? Yes. As a short-barrel rifle, this is a Title II firearm requiring an approved ATF Form 4 and transfer through an NFA-licensed dealer.

What magazine does it ship with? A 30-round Magpul PMAG.

Are the controls ambidextrous? Yes, the bolt catch/release, magazine release, and safety selector are all fully ambidextrous.

Buy the LWRC ICMKII SBR

This is a Title II item regulated under the National Firearms Act. Purchase requires an approved ATF Form 4, no federal transfer tax, and transfer through a licensed NFA (SOT/Class 3) dealer, with an extended federal approval wait before delivery. Order through LWRC‘s semi-auto rifle lineup and our Lubbock, Texas team will walk you through the transfer process.