Mk 12 Mod H Gen Iii Diy Kit W/Pri Rear Sight Recce Rail Fde

The Precision Reflex Mk 12 Mod H Gen III DIY kit puts together one of the most proven recce rifle builds in the hands of someone who wants to assemble it themselves. This is a complete component set for builders who understand their way around an AR platform and want to spec out a rifle that delivers the ergonomics, handling, and modularity that defined the original MK 12 concept. If you're building a precision rifle for mid-range work, dynamic shooting, or a duty-oriented recce platform, this kit gives you the core upper-end pieces to get there without the guesswork.

Precision Reflex has engineered each component to work together as a system. The Gen III rifle-length forearm pairs with the Gen III Recce rail to give you a clean, purposeful handguard setup that won't slow you down. Rail-mounted front and rear flip-up sights keep your optics mounting real estate open and let you maintain a fighting rifle that works without batteries. The Gas Buster charging handle with military-profile Big Latch is built for positive control and gloved operation, and the included AE brake and collar finish the muzzle end with reliability and repeatability in mind.

This is a kit for the builder, not the turn-key buyer. You'll need to source a lower receiver, complete it to spec, and handle the final assembly and headspacing yourself. If you're comfortable with that process and want a recce-oriented rifle that handles well in field conditions, the MK 12 Mod H Gen III delivers proven performance in a format you can trust.

Key Features

• Gen III rifle-length PRI forearm and Recce rail system
• Rail-mounted flip-up front and rear sights for co-witness capability
• Gas Buster charging handle with military-spec Big Latch
• AE brake and collar included for muzzle control
• Modular design supports optics and accessory mounting
• DIY kit—you complete the lower receiver and final assembly

Specifications

Frequently Asked Questions

What do I need to provide to complete this build?

This kit includes the upper-end components. You'll need to source a lower receiver, complete it per federal and local law, and handle final assembly and headspacing yourself. If you're not experienced with AR building and headspacing, consult a qualified gunsmith before firing.

Will this kit work with standard AR-15 parts?

Yes—the Mk 12 Mod H is built on the AR-15 platform, so standard AR lowers and compatible parts work with this system. Verify compatibility of any additional components you source separately.

What's included in the box?

The kit includes the Gen III rifle-length forearm, Gen III Recce rail, PRI rail-mounted flip-up front and rear sights, Gas Buster charging handle with military Big Latch, and AE brake with collar.

Is this suitable for a first-time AR builder?

This is a component kit for experienced builders. If you're new to AR assembly, consider having a qualified gunsmith complete the build or instruct you through the process to ensure safe operation and compliance.