LWRCI ICMKIIP5B12SBA3 PST 556 SBA3 BRC 12.7 BLK
Specs at a glance
About this product
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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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
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