Haga Defense Kuna Extended Handguard

3.6-oz nylon handguard that extends 2.75 inches past the factory receiver. Must be paired with a suppressor or muzzle extension.

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Quick Specs

Price: $180
Weight: 3.6 oz
Brand: Haga Defense
Category: handguard

Features

•Premium nylon, made in USA
•3.6 oz added weight
•6.5 inches total length
•Extends 2.75 inches past receiver
•M-LOK sides and bottom, 1913 top

Compatibility Tags

family: pccplatform: springfield-kunahandguard: mlok

Overview

Haga Defense's Extended Handguard for the Kuna adds 2.75 inches of forward real estate to the factory integral handguard without any permanent modification to the receiver. Construction is premium nylon, and the 3.6 oz added weight barely registers on the gun. M-LOK slots on the sides and bottom host lights, lasers, and grips. A continuous 1913 Picatinny rail extends the factory top rail for BUIS or optic relocation.

Critical safety note: this handguard is designed to be used with a suppressor or muzzle extension. Haga is explicit that firing the Kuna without one while this handguard is installed will damage both the handguard and nearby accessories from muzzle blast. Haga specifically recommends the Midwest Industries Blast Can (direct thread) or the Angstadt Arms Blastwave (tri-lug) at minimum. Suppressors up to 1.65 inches in diameter fit; larger cans need an air gap for cooling.

This is the right handguard for a suppressed Kuna build and the wrong handguard for anything else.

Key Features

6.5 inches total, extends 2.75 inches past receiver
3.6 oz added weight
M-LOK slots on sides and bottom
Continuous 1913 Picatinny top rail
Zero permanent modification to receiver
Premium nylon, made in USA

Pros

+Substantial forward real estate gain for a tiny weight penalty
+M-LOK bottom for grip or light, 1913 top for optic or BUIS
+No permanent modification to the upper

Cons

−MUST run a suppressor or muzzle extension, cannot fire bare muzzle
−Fits suppressors up to 1.65" diameter only
−$180 is substantial for a handguard shell

Setup & Operation

Step-by-step procedures for setting up, operating, and maintaining the Haga Defense Kuna Extended Handguard.

→ Before You Install: Suppressor or Blast Device Is Mandatory
→ Install the Kuna Extended Handguard

Before You Install: Suppressor or Blast Device Is Mandatory

This handguard cannot be run on a bare muzzle. The 2.75 inches of nylon that extend past the receiver sit directly in the path of muzzle blast, and Haga Defense states that firing the Kuna without a suppressor or muzzle extension installed will damage the handguard and any accessories mounted to it.

Haga Defense names two acceptable minimum solutions: the Midwest Industries Blast Can for direct-thread muzzles and the Angstadt Arms Blastwave for tri-lug muzzles. Either device, or a full suppressor, moves the blast clear of the nylon. Suppressors up to 1.65 inches in outside diameter fit inside the handguard; larger cans need an air gap and may require the shorter M-LOK screws Haga supplies for clearance.

Caution

Do not fire the Kuna with this handguard installed unless a suppressor, the Midwest Industries Blast Can, or the Angstadt Arms Blastwave is attached. Bare-muzzle fire will damage the handguard and mounted accessories.

Install the Kuna Extended Handguard

The handguard mounts to the Kuna receiver entirely with the included screws and M-LOK nuts. There is no permanent modification, no barrel work, and no factory part removal beyond the handguard hardware itself. The only difficulty is seating the M-LOK nuts inside the receiver's internal rail slots, which is why Haga Defense's install video uses a plastic knife as a slide tool.

Work with the firearm unloaded and, ideally, clamped in a vise or held by a second person. A vertical stand makes the final handguard snap-on easier.

What you need

• 1/8 inch hex driver
• Plastic knife or long flat non-marring tool
• Inch-pound torque wrench
• Vise or a second pair of hands

01
Confirm the Kuna is unloaded
Remove the magazine, lock the bolt to the rear, and visually and physically inspect the chamber before any work on the receiver.
02
Prep the mounting hardware
Remove the screws and M-LOK nuts from the handguard. Thread each screw partway back into its nut and back it off until the end of the screw sits flush with the face of the M-LOK nut. This flush setup lets the nut slide into the receiver slot without the screw tip catching.
03
Seat the first M-LOK nut
Using the plastic knife or flat tool, slide one M-LOK nut into the receiver's internal rail slot on side A. Once it is positioned, run the screw in a few turns to temporarily hold the nut in place. A dab of grease on the tool helps keep the nut from slipping off during the slide.
04
Seat the second M-LOK nut
Repeat the slide-and-temporary-screw process on side B. Both nuts should now be held in their receiver slots by the temporary screws.
05
Stand the firearm upright and back out the temporary screws
Set the Kuna vertical in a stand or vise. Remove the temporary holding screws while leaving the M-LOK nuts seated in their recessed slots.
06
Snap the handguard onto the receiver
Press the handguard onto the receiver as shown in the install video, keeping each M-LOK nut pulled into its recessed slot so it stays aligned with the handguard's screw holes.
07
Thread the screws by hand
Use the long flat tool to hold each nut flush with the receiver, then start every screw by hand. Hand-starting avoids cross-threading the nylon and the nut threads.
08
Torque the screws to 15 in-lb
With all screws hand-threaded, tighten each one to 15 inch-pounds with an inch-pound torque wrench. Even torque across all screws keeps the handguard centered on the receiver.

Tip

If a larger-diameter suppressor will not clear the M-LOK screw heads, swap in the shorter M-LOK screws Haga Defense includes for that purpose before final torque.