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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount RRD-4C-13LS-KM

JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, Black, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, Black, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, Black, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM
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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, RRD-4C-13LS-KM

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Questions & Answers

Product No Longer Available

Unfortunately JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount is not listed by OpticsPlanet.You can also explore other items in the Weapon Accessories, Gun Parts, Muzzle Devices, Muzzle Brakes & Compensators yourself to try and find the perfect replacement for you!

Product Info for JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount

(R)ecoil(R)eduction(D)evice(4) ports(C)ompensator(13L) M13-1L threads(S)houlder(KM) KeyMount.image

The best of both worlds! Our super effective RRD4-4C muzzle brake comp with KeyMount suppressor mount!

These are designed to install with a shim kit on standard shoulder mount style barrels (factory muzzle device installed with crush washer) and can be permanently attached using the (optional) pin.

M13x1 LH Threads (Fits Most original AUG rifles)

MAKE SURE YOUR AUG HAS LEFT HAND THREADS BEFORE ORDERING, MOST NEW AUG RIFLES HAVE 1/2-28 THREADS

Keymount & X-Series Suppressor Compatibility

JMac Customs is NOT responsible for improper installation of this muzzle device or any damage to the suppressor using this device. We recommend this be professionally installed and checked to ensure alignment.

This is a licensed product through Dead Air Silencers.

Features of JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount

  • 4 Port Muzzle Brake with KeyMount

Package Contents:

  • JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount

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JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake w/ KeyMount Unavailable & Discontinued Models

List of Unorderable Models

  • JMac Customs 4C AUG 13x1LH 4-Port Muzzle Brake with KeyMount, Black Nitride, Black, RRD-4C-13LS-KM , MPN: RRD-4C-13LS-KM , Code: 4VI-BMB-JMC0343-RRD-4C-13LS-KM
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Last updated 2026-09-08 UTC.