JMAC Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM
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Jmac Customs
Overview
The JMac Customs RRD-4C KeyMount muzzle device is designed specifically for 9mm calibers and features a 1/2x28 thread pitch, allowing for easy attachment to compatible barrels. This muzzle device effectively reduces recoil and muzzle rise, enhancing overall control during rapid firing. It's commonly used in builds that employ a carbine gas system and are chambered for 5.56 NATO, making it a versatile choice for those looking to optimize their performance.
Specifications
JMAC Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM
Build history on GunPartPicker
Builders have added the JMAC Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM to their builds on GunPartPicker. Since April 2026, it ranks #159 of the 565 muzzle devices builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today only Palmetto State Armory has it in stock. Prices barely moved in October 2026, holding around $119.99, with no real sale all month. Buying today, the lowest price is $119.99 at Palmetto State Armory, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
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Strike Industries AR-15 Ultimate Dust Cover - Texas Edition V1
Spike's Tactical Flat Top Upper w/ Ejection Port Door, 9MM, Black - SFT902D
Midwest Industries Quad Rail AR-15 Handguard - 15"
Rosco Manufacturing Bloodline 5.56 AR-15 Barrel Government Carbine - 11.5"
Builds Featuring This Part
See all builds →Builds in the community that include the JMac Customs RRD-4C KeyMount Muzzle Device w/ 1/2-28 Threads - RRD-4C-28F-KM
| Build | Parts | Total |
|---|---|---|
 | 13 | $1185.14 |
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