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These are complete 9mm RDB uppers and come with CMMG RDB BCG's and ported barrel installed, so they are integrally suppressed ready. The barrels feature M18x1 threads and porting like the MP5SD. The ports bleed off gas so that 115 grain ammo will be subsonic. These uppers are compatible with MPSSD type suppressors only and we highly recommend HiTec Arms as they're excellent quality and easily serviceable. They also work with my SD adapters as well, if you have a 9mm suppressor you want to use.
Please visit them at https://hitecarms.com/
These work perfectly with our SD uppers.
Our handguard is designed specifically to mount the MP5SD shroud onto and is now included. The Radial Delayed Blowback system operates with a standard carbine buffer and doesn't require the heavy buffers that are usually needed for reliable cycling. The barrel porting combined with the RDB system makes these soft shooters with very little recoil. 4-6 weeks lead time.