LWRCI ICMKIIP5B12SBA3 PST 556 SBA3 BRC 12.7 BLK

LWRCI ICMKIIP5B12SBA3 PST 556 SBA3 BRC 12.7 BLK

$3,123.68

The LWRCI IC-MKII pistol with 12.7-inch barrel and SBA3 brace delivers the legendary reliability of a short-stroke gas piston system in a compact package. Built for ranchers and rural shooters who need a truck gun that runs clean and cycles suppressed or unsuppressed without tools.

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SKU: TSW|184165 Category:

Description

The LWRCI IC-MKII in 5.56 with a 12.7-inch barrel and SBA3 brace is a purpose-built AR pistol that doesn’t waste time on flash. This is the lwrci icmkiip5b12sba3 pst 556 sba3 brc 12.7 blk configuration, and it’s meant for one thing: getting the job done when the weather turns foul, the dust kicks up, and you need a compact carbine that runs.

Manufacturer LWRCI (per manufacturer specs)
Model IC-MKII Pistol (PST 556 SBA3 BRC 12.7 BLK)
Material 7075-T6 aluminum receiver, cold hammer-forged barrel
Compatibility 5.56 NATO / .223 Remington magazines
Finish Black hardcoat anodized (BRC)
Weight 6.4 lbs (per manufacturer specs)
Condition New

Key Features

  • Short-stroke gas piston system — WHY IT MATTERS: This keeps carbon and fouling out of the receiver, meaning you run longer between cleanings and get reliable function in mud, snow, or sand. Over 1 million rounds of field testing by LWRCI backs this design.
  • Adjustable two-position gas block (paddle style) — WHY IT MATTERS: Located inside the handguard and easy to reach, you can flip between suppressed and unsuppressed settings without tools. That matters when you’re running a can on a ranch or in the field.
  • M-LOK handguard — WHY IT MATTERS: Lets you mount lights, grips, or bipods exactly where you need them, without adding bulk. The rail is slim, free-floating, and stays cool under fire.
  • 12.7-inch cold hammer-forged barrel — WHY IT MATTERS: Shorter than a rifle but longer than a typical pistol barrel, it balances velocity with maneuverability. You get full 5.56 performance out to 300 yards without the length of a 16-inch gun.
  • SBA3 pistol brace — WHY IT MATTERS: Adjustable like a carbine stock but legal as a brace, it gives you a solid cheek weld and lets you shoot one-handed when you need to grab a fence or a gate.

Who It’s For

This pistol is for the rancher who needs a truck gun that won’t jam when the dust blows. It’s for the rural property owner who wants a compact defensive tool that hits hard and runs clean. If you work with your hands and need a firearm that’s as reliable as your pickup, this is it.

Pros & Cons

  • Pro: Gas piston system means less cleaning and more uptime. You can shoot 500 rounds without a hiccup.
  • Pro: The 12.7-inch barrel is a sweet spot — short enough to stow in a backpack or behind a seat, long enough to ring steel at 200 yards.
  • Con: Heavier than a direct-impingement AR of the same length — the piston adds about 8 ounces up front. You’ll feel it if you’re carrying all day, but the trade-off is reliability you can bank on.

Comparison vs. Competitors

Feature LWRCI IC-MKII Pistol Geissele Super Duty Pistol Zev Technologies OZ9C
Operating System Short-stroke gas piston Direct impingement Striker-fired (pistol)
Barrel Length 12.7 in 11.5 in 4.5 in
Caliber 5.56 NATO 5.56 NATO 9mm
Weight 6.4 lbs 6.2 lbs 2.1 lbs
Brace SBA3 adjustable SBA3 adjustable N/A (handgun)
Gas Block Adjustment 2-position, tool-less Not adjustable N/A

FAQ

Is the LWRCI IC-MKII piston system reliable in cold weather?

Yes. The short-stroke piston system was designed for extreme conditions. LWRCI has tested it in sub-zero temps and sand environments. It runs cleaner and more reliably than direct-impingement guns in cold, wet, or dusty conditions.

Can I mount a suppressor on this pistol?

Yes. The two-position gas block has a suppressed setting. Just flip the paddle inside the handguard to reduce gas blowback when running a can. The 12.7-inch barrel is also a good length for suppressor use without being too long.

What magazines work with the IC-MKII?

Any standard AR-15 magazine in 5.56/.223 will work. LWRCI recommends Magpul PMAGs, but GI-style aluminum mags and others function fine.

How does this compare to a standard AR-15 pistol?

The IC-MKII’s piston system is the main difference. It keeps the action cleaner, reduces heat transfer to the bolt, and requires less lubrication. The trade-off is a slightly heavier front end, but for a truck gun or ranch tool, the reliability is worth it.

Why Buy From Us

  • ✅ Nationwide delivery (all 50 states)
  • ✅ Ships 1-2 business days
  • ✅ 30-day returns
  • ✅ Secure checkout

Last updated: April 2026

See more in our AR Pistols collection, or browse LWRCI firearms and pistol braces.

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