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Joined:
Jul 2022
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USA
Posted: 5/5/2026 10:03:11 AM EDT
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Have a Rock River factory SBR. The barrel is 7 in with heavy contour. Looking for a complete upper 9 mm Compatible with Colt style magazine Would prefer 5 in barrel. Any direction on who is producing such would be appreciated. Thanks |
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First question is, how much is your budget? Do you want straight blow back or radial delay blow back? CMMG sells their RDB fixed ejector retrofit kit for $425 (they do have sales on them too, I got mine out the door including tax and shipping for $370). It's the receiver and RDB bolt. Add a barrel, charging handle, etc and assemble your own. Better yet, speak to Amphibian here, he'll square you away. I bought a 5" barrel from him with single feed ramp. The entire build, including the RDB receiver kit, barrel, hand guard, charging handle, sight, and some Endomags was right at $700. I did also add an A5 buffer tube, Neverwear Warthog spring and Kynshot hydraulic buffer as well. Closest thing to an MP-5 in terms of soft shooting I think.  My son ripping off some rounds:  CMMG RDB 9 |
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