The LWRC IC-MKII Oscar Foxtrot 5.56 is a short-stroke piston carbine from LWRC International, built on the MKII version of the Individual Carbine with a 12.7-inch barrel and a Tungsten Gray finish (brand part no. ICMKIIO5TG12). The MKII pairs a one-piece Monoforge upper receiver with an M-LOK handguard, and its adjustable gas block now sits inside the rail where it is easy to switch between suppressed and unsuppressed settings. Fully ambidextrous controls, a compact stock and a cold hammer forged 1:7 twist barrel make it a quick, light 5.56 build for the truck, the barn or the range. LWRC adds Skirmish back-up iron sights, so the rifle is ready to run before you choose an optic.

Key Specifications

• The chambering is 5.56 NATO, the standard service cartridge, widely available and well supported.
• Barrel length is 12.7 inches, a compact length that keeps the rifle short and maneuverable.
• The barrel is cold hammer forged with a 1:7 right-hand twist, a rate that stabilizes a wide range of bullet weights.
• Operation is by a short-stroke gas piston with a two-position adjustable gas block, which LWRC says delivers reliability in extreme conditions and is easy to maintain, and the block can be set for suppressed or unsuppressed use.
• The finish is Tungsten Gray, one of the Cerakote colors LWRC offers on the IC-MKII line.
• The handguard is M-LOK on a Monoforge one-piece upper receiver, giving you rail space for lights, grips and accessories without extra hardware.
• Controls are fully ambidextrous, covering the bolt catch, bolt release, magazine release, safety selector and charging handle for left or right hand use.

Frequently Asked Questions

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for short-barreled rifles. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply. Taking an SBR across state lines still requires an approved ATF Form 5320.20.

Is this a piston rifle or direct impingement? It is a piston rifle. LWRC uses its patented short-stroke gas piston system with a two-position adjustable gas block, which the MKII places inside the rail.

What muzzle threads does it have? LWRC lists the IC-MKII muzzle threads as 1/2×28 TPI, the common pattern for flash hiders, brakes and suppressors.

Buy the LWRC IC-MKII Oscar Foxtrot 5.56 NATO Short-Barreled Rifle

As of October 9, 2026, this short-barreled rifle transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through LWRC‘s AR rifles lineup and our Lubbock, Texas team will handle the transfer.