B&T HANDGUARD 3X NAR FOR MP5K BLK

Modernize your compact submachine gun with the B&T HANDGUARD 3X NAR FOR MP5K BLK (SKU: BT-21573). Engineered by the Swiss masters at Brügger & Thomet, this tri-rail handguard is the professional standard for adding modularity to the MP5K platform. While the factory vertical grip handguard is iconic, it offers zero mounting options for modern tactical needs. The 3X NAR (NATO Accessory Rail) replaces it with a rock-solid, all-aluminum interface that transforms your PDW into a mission-ready tool.

As an OEM supplier for Heckler & Koch, B&T designs this handguard to meet the most stringent military requirements for fit, finish, and durability.

Swiss Precision: Built for the “K” Platform

The MP5K is defined by its ultra-compact dimensions. The B&T BT-21573 is specifically designed to maximize that limited real estate without adding unnecessary bulk. Machined from high-strength aerospace aluminum and finished in a deep black hard-coat anodization, it matches the factory HK finish perfectly while providing a much more robust gripping surface.

Why the 3X NAR is a top-tier upgrade:

• Tri-Rail Configuration: Features three NATO standard Picatinny rails located at the 3, 6, and 9 o’clock positions. This allows you to simultaneously mount a weapon light, a laser system, and a vertical foregrip.

• Rock-Solid Lockup: Unlike polymer handguards that can flex or wobble, this aluminum unit provides a repeatable zero for rail-mounted lasers.

• Enhanced Heat Dissipation: The ventilated aluminum design allows the barrel to cool more efficiently during high-volume strings of fire, protecting both the operator and the weapon’s internal components.

• Professional Ergonomics: The slim profile ensures the MP5K remains easy to maneuver in tight spaces, while the rails provide a tactile, non-slip surface for improved weapon control.

Key Features and Benefits

• Drop-In Installation: No gunsmithing or permanent modifications required. It installs in seconds using the existing factory push-pins.

• Lightweight Performance: Weighing in at only 5.18 ounces (147g), it provides heavy-duty mounting capability without significantly altering the balance of your firearm.

• Combat Proven: Trusted by elite special forces and law enforcement units globally who require a fail-proof mounting system for their MP5K-PDWs.

• Mil-Spec Durability: Built to withstand extreme impacts, thermal shifts, and harsh chemical solvents without degrading.

Technical Specifications

Universal Compatibility

The B&T 3X NAR Handguard is precision-molded for the two-pin “K” receiver pattern. It is the perfect fit for:

• Heckler & Koch: SP5K, SP5K-PDW, MP5K, SP89.

• American & Overseas Clones: Century Arms AP5-P/AP5-M, Zenith ZF-5P/ZF-5K, PTR 9KT, and the Military Armament Corp MAC-5K.

Note: This model is not compatible with full-size (one-pin) MP5/SP5 receivers.

Why Choose B&T?

B&T is world-renowned for making the finest accessories for HK platforms. When you install the BT-21573, you aren’t just adding a rail; you are installing a piece of professional equipment used by professionals. It offers the perfect balance of “old school” HK reliability and “modern day” modularity.

Upgrade your MP5K with the ultimate Swiss-made mounting solution. Add the B&T 3X NAR Tri-Rail Handguard to your build today.