CMMGBolt Carrier GroupsPremium

CMMG Fixed Ejector Retrofit Kit, 9mm

Current CMMG 9mm Radial Delayed Blowback retrofit kit built around the fixed-ejector upper and matching bolt-carrier setup.

Price: $425
Brand: CMMG
Category: Bolt Carrier Groups

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Featured in

Best AR-9 Accessories & Upgrades 2026

guide · gear · 13 min read

Features

•9mm Radial Delayed Blowback retrofit kit
•Fixed-ejector upper and matching BCG setup
•Reuses existing handguard, barrel nut, and barrel
•Works with compatible CMMG 9mm RDB uppers
•Does not work with Mk9 lower

Capability Boosts

Reliability+1

Mobility+1

Recommended For

hunting sidearm+2

backpacking+2

backpack gun+2

survival+2

Home Defense

Duty/Patrol

+18 more

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Compatibility Tags

family: pccfamily: ar-patternplatform: custom-ar-9platform: builder-hiddencaliber: 9mmmag-type: cmmg-arcar9-system: cmmg-rdb

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Add the CMMG Fixed Ejector Retrofit Kit, 9mm to your build and see how it enhances your platform.

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