All SD Conversions

Explore All SD Conversions from Ronin Arms, based in Payson, AZ—your source for precision integrally suppressed upgrades. These conversions transform standard firearms into ultra-quiet SD (Schalldämpfer) systems using ported barrels. Every conversion is handcrafted, TIG-welded, and tuned to run subsonic with standard 115gr 9mm ammo—no special loads needed.

Choose from multiple platforms including the AP5-SD Conversion, MPX SD Conversion. Compact options like the AP5-SD-K and MP5 to MP5SD-K Conversion are also available.

Ryan Priest

Reviewer

5/5

Can't wait to get ahold of one.

1 month ago

RA9-SD K 5.75" Ported Barrel

Ryan S

Being one of the more expensive conversions, I had some high expectations, and Ronin Arms surpassed them. I’ve watched/read several reviews of conversions from other companies and saw things like the a few supersonic cracks from 115s, leaving the standard cocking tube, no refinish, etc. The work and attention put into my gun was well worth the wait and price. They gave attention to the small details like lining the cocking tube up perfectly, clean welds on the SD cage to spec. As far as the actual shooting, this is the quietest, smoothest MP5 I’ve shot. I ran 300 rounds of 115gr with no issues, and thanks to their unique porting, it’s not filthy at all. Highly recommend.

3 months ago

AP5-SD Full-Size Conversion

Also, I would like to thank you and your team for the incredible work you guys did! After shooting the MPX last weekend for the first time since the modifications, I can confidently say it’s become my favorite gun—quite a statement considering my collection.

I truly appreciate all your help throughout the process.

Wishing you a great day ahead!

5 months ago

MPX-SD K Conversion Service

Bryan F.

If you don’t absolutely LOVE it, there is something wrong with you.
Quality work resulting in superior performance. I would not hesitate to do this again, as a matter of fact I’m debating a second one.
Sound suppression is phenomenal, especially when compared to end of barrel suppression. Night and day; don’t want, just get it. You know the saying, buy once cry once.

6 months ago

Jeffrey L.

Purchase to range in less than 30 days during the holiday season. Gun runs flawlessly and is "Hollywood" quiet. I am so impressed with this setup I just bought another MPX and will be ordering the full-size setup. A++++ 5 Stars!

Great Job Brother!!!!

All SD Conversions

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MPX-SD Fullsize Conversion Service

MPX-SD K Conversion Service

RA9-SD K Wakizashi in 8″ configuration (AR9 Platform)

RA9-SD Katana SD 12″ Standard Config

RA9-SD 6.75″ Ported Barrel

RA9-SD K 5.75″ Ported Barrel

MP5 to MP5SD Conversion

MP5 to MP5SD-K Conversion

Wave Washer

AP5-SD Full-Size Conversion

AP5-SD K Conversion

Wakizashi 8″

Katana