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(K Receivers)MP5K to MP5K-SD Conversion
$5,100.00
1 in stock
“In Stock” does not mean ready to ship. It means we have the required components available and can place your MP5K-SD™ conversion into our active 2–4 month conversion queue.
Your MP5K-SD™ conversion is individually built, fit, and tested one at a time by one gunsmith.
The 2–4 month conversion timeline begins once your firearm has been received, checked in, and all required components and information have been verified.
These are not pre-built conversions sitting on a shelf ready to ship. Every MP5K-SD™ conversion requires individual gunsmithing, fitting, inspection, testing, and processing before it can leave our shop.
RONIN ARMS™ DOES NOT COMPLETE YOUR ATF FORM 4473 OR YOUR LOCAL CUSTOMER TRANSFER.
Your suppressor will be transferred from Ronin Arms™ to your selected local FFL/SOT. Your local dealer will handle the Form 4473, background check, and any other customer-facing transfer requirements applicable under current federal, state, and local law.
Ronin Arms™ handles the required manufacturer/dealer transfer process necessary to send the suppressor to your FFL/SOT. Your local FFL/SOT handles the final transfer to you.
Please contact your selected FFL/SOT with questions regarding the Form 4473, background check, identification requirements, waiting periods, or any other requirements that may apply to your individual transfer.
Conversion and transfer timing can vary depending on:
🔹 Receipt and check-in of your firearm
🔹 Receipt of your dealer’s FFL/SOT information
🔹 Current conversion queue and order volume
🔹 Individual gunsmithing, fitting, and testing
🔹 Form 3 submission and approval timelines
🔹 Scheduled shipping days
Each MP5K-SD™ conversion is individually inspected, tested, and verified to Ronin Arms™ standards before shipment.
As a boutique firearms manufacturer, we intentionally limit the number of conversions placed into our active queue to maintain quality and ensure every platform receives the attention it deserves.
One conversion. One gunsmith. Built the way it should be.
Our goal is simple: build it right the first time, not build it fast.
Thank you for supporting American manufacturing and the Ronin Arms™ family.
This conversion is STRICTLY for MP5K variant (K-length) receivers only.
❌ DO NOT purchase this conversion if you have a full-size MP5
Full-size MP5 platforms require our MP5 to MP5SD Conversion, which is a different system.
✔ MP5K / SP5K / AP5-P / PTR 9KT → Correct product
❌ MP5 / SP5 / AP5 / PTR 9CT → Incorrect product
Please confirm your platform before purchasing.
If you have a K variant MP5 platform, this is the conversion you need.
✔ HK MP5K / MP5K-N
✔ HK SP5K / SP89
✔ Century Arms AP5-P / AP5-M
✔ PTR 9KT
✔ Zenith ZF-5P / Z-5P / Z-5K
✔ POF MP5K variants
✔ Dakota Tactical D54K variants
✔ Omega / TPM / RDTS / Brethren K builds
✔ Other MP5K pattern clones
📌 If it is a K-length receiver—this is the correct conversion.
This is a full MP5K SD conversion service.
You will send in your MP5K upper receiver, and we convert it into a true integrally suppressed MP5K SD system.
Due to the design of the K platform, these conversions require:
✔ Structural modification
✔ Component grafting
✔ Additional system integration
Your platform is hand built, fit, grafted, and tested by one gunsmith.
The MP5SD platform is legendary for a reason—exceptional suppression, smooth recoil impulse, and unmatched shootability.
The Ronin Arms™ MP5K SD Conversion brings that same performance to the K platform.
This is a true system transformation, not a basic modification.
Every conversion is completed under our core philosophy:
“Accept No Imitations. One Gun. One Gunsmith.”
✔ No shortcuts
✔ No drop-in kits
✔ No universal solutions
✔ True MP5K Integrally Suppressed System
✔ MP5SD Ported Barrel Technology
✔ Titanium suppressor engineered for SD performance
✔ Hand built, fit, and tested
✔ Engineered specifically for K platforms—not adapted
The MP5K platform requires additional engineering and fabrication to properly run an SD system.
✔ Components must be grafted into the receiver structure
✔ System must be re-engineered for proper function
✔ Additional tuning and alignment is required
This makes MP5K conversions:
✔ More complex
✔ More labor intensive
✔ More time consuming
We do not shortcut this process—because performance depends on doing it right.
✔ Precision ported for SD performance
✔ Allows 115gr and 124gr ammunition to run subsonic
✔ Eliminates the need for subsonic ammunition
✔ Optimized for reliability and accuracy
✔ Grade 5 Titanium (6AL-4V)
✔ Approx. 8” length | Approx. 9.7 oz | 1.65” diameter
✔ Full-auto rated
✔ Designed to run 40–50K rounds before cleaning is needed
✔ Suppression improves as carbon builds
✔ Optimized gas flow for reduced backpressure
✔ Components are grafted and fully integrated into your platform
✔ System tuned specifically to your receiver
✔ Built as a complete SD system—not separate parts
✔ Locking piece configuration is platform dependent
✔ Adjusted as needed for proper timing and cycling
✔ Some platforms already have correct geometry
All tuning is completed in-house as part of the full system.
Every conversion is fully refinished before it leaves our shop.
✔ Stripped, prepped, and refinished after all work is completed
✔ Returned in HK Black professional finish
✔ Corrosion-resistant and built for long-term durability
This is not partial work or touch-up.
Your platform is returned complete, uniform, and finished the right way.
✔ Full disassembly and inspection
✔ Structural grafting and modification
✔ Barrel installation and alignment
✔ Suppressor integration and system fitment
✔ Full refinish in HK Black
✔ System tuning and adjustment
✔ Live-fire testing before return
Each conversion is completed by one gunsmith from start to finish.
✔ Upper receiver
✔ Bolt carrier group (recommended)
✔ Printed order receipt
🚫 Do NOT send extra parts (stocks, optics, etc.)
✔ Suppressor shipped to your FFL/SOT
✔ Converted upper returned directly to you
✔ ATF Form 4 completed through your FFL
All conversions are custom-built to order.
❌ No cancellations
❌ No returns
❌ No refunds
Please confirm compatibility before ordering.
This is not a basic upgrade.
This is a true MP5K SD conversion, engineered to bring full SD performance to a compact platform.
If you own a K variant—this is the conversion you need.
“Accept No Imitations. One Gun. One Gunsmith.”™
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