Description
The Primary Weapons MK116 Mod 1 300 Blackout, 16.1″ Barrel, Adj Stock, Black, 30rd is a purpose-built, piston-driven AR-platform rifle chambered in the versatile 300 AAC Blackout cartridge. It’s designed for reliable performance with both supersonic and subsonic ammunition, featuring a robust long-stroke piston system and a fully ambidextrous lower receiver. This isn’t just another AR—it’s a refined tool built for serious use.
Key Features
- Piston-Driven Reliability: The long-stroke piston system keeps the action cooler and cleaner than direct impingement, a huge plus when running suppressed.
- Fully Ambidextrous Controls: Magazine release, bolt catch/release, and safety selector are mirrored for left or right-handed shooters.
- Monolithic Upper Receiver: The MK116 upper is a single, rigid piece of 7075-T6 aluminum for exceptional zero retention and accessory mounting.
- 16.1″ 4150 Chrome-Moly Vanadium Barrel: Optimized for the 300 Blackout round with a 1:7 twist rate to stabilize a wide range of bullet weights.
- Adjustable Stock & Ergo Grip: The 6-position Milspec buffer tube and Ergo grip provide a solid, customizable cheek weld and comfortable hold.
Specifications & Details
| Caliber | 300 AAC Blackout |
|---|---|
| Barrel Length | 16.1 inches |
| Overall Length (Stock Adjusted) | Approx. 32.5″ – 35.75″ |
| Weight (Unloaded) | Approx. 7.8 lbs |
| Magazine Capacity | 30 Rounds (Magazine Included) |
| Operating System | Long-Stroke Piston |
I’ve put a few hundred rounds of mixed supers and subs through a similar setup, and the difference in how the gun feels after a session is noticeable. The piston system really does keep the bolt carrier group and upper receiver noticeably cleaner and cooler. The monolithic rail is rock-solid—once you mount an optic and a light, you won’t worry about things shifting. At a price of $1358.10, you’re getting a complete, high-end rifle that’s ready for optics, lights, and a suppressor right out of the box. It’s mil-spec compatible where it counts, so you can use standard AR-15 triggers and many aftermarket parts if you want to personalize it later.
Who This Rifle Is For
This MK116 Mod 1 is for the shooter who wants a do-it-all 300 Blackout platform without the tinkering. It’s ideal for hunters looking for a potent, short-to-medium-range deer rifle, home defenders who plan to run it suppressed, or anyone who values the inherent reliability of a piston system over a traditional DI gun. If you’re building a “go-to” rifle for scenarios where you might not be able to clean it meticulously between uses, the piston design makes a compelling case.
Pros & Cons
Pros: Exceptional build quality and fit. The ambidextrous controls are intuitive and well-executed. Piston operation enhances reliability with dirty ammunition or when suppressed. The 16.1″ barrel squeezes most of the velocity potential from the 300 BLK cartridge. It’s a complete, no-compromise package.
Cons: The piston system adds some weight over a DI rifle—you feel it upfront. The proprietary upper means you can’t easily swap it onto another lower. And let’s be honest, 300 Blackout ammo is more expensive to feed than 5.56, so factor in range costs.
Frequently Asked Questions
Q: Is this rifle compatible with standard AR-15 parts?
A: Mostly, yes. The lower receiver accepts standard mil-spec triggers, pistol grips, and buffer tubes. The upper receiver and piston system are proprietary to PWS, so you can’t swap in a different upper. Think of it as a top-tier, complete system.
Q: Can I shoot supersonic and subsonic ammunition without adjusting the gas?
A: Yes. PWS’s Mod 1 series features an adjustable gas block. You get a tool to easily switch between settings for suppressed/unsuppressed and high/low-pressure ammo. It’s a simple but crucial feature for a versatile 300 BLK platform.
Q: What optics or accessories work well on this rifle?
A: The full-length monolithic rail is perfect for a low-power variable optic (LPVO) like a Vortex Viper PST or a red dot/magnifier combo. There’s ample real estate for a weapon light, like a SureFire or Cloud Defensive model, and a forward grip. The platform begs to be customized.
Look, if you want a battle-ready 300 Blackout rifle that works from day one without fuss, the PWS MK116 Mod 1 is a standout choice. It’s available at firearms-missouri.com for Missouri residents and nationwide. FFL transfer required for firearm purchases. Check the product page for current availability and to start the process.
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