Description
The Primary Weapons MK112 AR-15 Short Barrel Rifle is a purpose-built, compact .223/5.56 platform featuring a 12.75-inch barrel and a 30-round magazine. It’s engineered for maneuverability and reliable performance in confined spaces, making it a serious contender for home defense and tactical applications where a full-length rifle would be a hindrance. This SBR configuration offers a significant ballistic advantage over a pistol-caliber carbine while maintaining a highly portable footprint.
Key Features
- 12.75-inch Cold Hammer Forged Barrel: Provides durability and consistent accuracy from a compact package.
- Short Barrel Rifle (SBR) Configuration: Maximizes maneuverability in vehicles, buildings, and tight quarters.
- Chambered in .223 Wylde: Safely and accurately fires both .223 Remington and 5.56x45mm NATO ammunition.
- Includes 30-Round Magazine: Ready for use out of the box with a standard capacity magazine.
- Mil-Spec Compatible: Built to widely accepted standards for reliable parts interchangeability and upgrades.
Specifications & Details
| Specification | Detail |
|---|---|
| Caliber | .223 Wylde (5.56 NATO Compatible) |
| Barrel Length | 12.75 inches |
| Overall Length (Approx.) | ~30 inches (stock collapsed) |
| Magazine Capacity | 30 Rounds (included) |
| Weight (Approx.) | ~6.5 lbs (unloaded) |
| Action | Direct Impingement |
Priced at $1682.78, this rifle represents a significant investment in a professional-grade tool. The .223 Wylde chamber is a key spec—it’s designed for tighter tolerances than a standard 5.56 chamber, which can enhance accuracy with both commercial .223 and hotter 5.56 loads. That said, you get the versatility to run almost any .223/5.56 ammunition you can find. The included 30-round PMAG is a known quantity, offering proven reliability that’s compatible with countless other AR-15 pattern rifles.
Who This Rifle Is For
This is for the shooter who needs a compact, rifle-caliber solution. When it comes to home defense, the MK112’s shorter barrel allows for quicker transitions in hallways and around corners compared to a 16-inch carbine. It’s also a logical choice for a vehicle rifle, where its reduced length is a major asset. Competitive shooters in certain tactical divisions will appreciate the balance of speed and power. It’s not a beginner’s plinker; it’s a tool for a defined role where size and terminal performance are critical factors.
Pros & Cons
Pros: The compact 12.75-inch barrel makes the rifle incredibly handy without sacrificing too much muzzle velocity. You retain effective rifle-caliber ballistics out to practical distances. The .223 Wylde chamber is a thoughtful touch for shooters who value precision. Since it’s mil-spec compatible, you can easily customize the trigger, handguard, or stock with parts from brands like Magpul or BCM.
Cons: The Short Barrel Rifle classification means you must comply with NFA regulations, including a $200 tax stamp and an extended approval wait before taking possession. The shorter barrel also increases muzzle blast and report—hearing protection is non-negotiable. At just over six and a half pounds unloaded, it’s not the lightest SBR on the market.
Frequently Asked Questions
Q: Is this a complete rifle, and what’s required to purchase it?
A: Yes, this is a complete, factory-built Short Barrel Rifle (SBR). Purchasing requires an approved ATF Form 4 and a $200 tax stamp. We handle the process through your local FFL, who will coordinate the transfer once approved. It ships to Missouri and compliant US states.
Q: Can I attach a suppressor to this rifle?
A: Absolutely. The barrel features standard 1/2×28 threads, ready for a muzzle device or direct-thread suppressor attachment. Using a suppressor on an SBR is highly recommended to mitigate the increased sound and blast, but remember that a suppressor also requires its own NFA tax stamp and approval.
Q: How does the .223 Wylde chamber affect my ammunition choice?
A: It gives you more flexibility, not less. You can safely fire both 5.56mm NATO and .223 Remington ammunition with optimal accuracy. Some standard 5.56 chambers can be less precise with .223 rounds, but the Wylde chamber is designed to handle both without issue.
If the role demands a compact, rifle-caliber tool, the Primary Weapons MK112 is configured to deliver. Available at firearms-missouri.com for Missouri residents and nationwide.
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