Ronin Arms™ MP5SD-K Integrally Suppressed Conversion

Build Time: 6-10 Weeks | Hand-Built Precision | Made in the USA

Experience true MP5SD performance in a shorter, more compact SD configuration. The Ronin Arms™ MP5SD-K delivers everything shooters love about the legendary MP5SD platform while reducing overall length and maintaining the reliability, suppression, and shootability that made the SD system famous worldwide.

Built on your existing full-size MP5 receiver, the MP5SD-K combines our proprietary 5.75″ ported SD-K barrel with the compact 8″ Titanium Wakizashi suppressor to create a fast-handling SD package that remains true to the original spirit of the MP5SD while offering a shorter overall footprint.

Whether you’re looking for a compact range gun, a unique collector piece, or simply prefer the handling characteristics of a shorter SD system, the MP5SD-K offers an exceptional balance of suppression, performance, and craftsmanship.

🔥 The MP5SD-K — Compact SD Performance, Done Right

The MP5SD platform has earned its reputation through decades of service and innovation. Known for its smooth recoil impulse, incredible suppression characteristics, and unmatched shootability, the MP5SD remains one of the most iconic suppressed firearms ever developed.

The Ronin Arms™ MP5SD-K takes that proven concept and packages it into a shorter, more compact SD configuration without sacrificing the characteristics that make the platform special.

Our MP5SD-K Integrally Suppressed Conversion transforms your standard full-size MP5 into a compact SD system utilizing a shorter titanium suppressor and optimized ported barrel system while maintaining factory-correct SD architecture and proven reliability.

Every MP5SD-K conversion is:

✔ Hand-built in the USA

✔ TIG-welded at all critical stress points

✔ Live-fire tested for function and suppression

✔ Final-inspected before release

✔ Built under our One Gun. One Gunsmith. philosophy

This is professional-grade SD engineering for shooters who want the legendary MP5SD experience in a more compact package.

✅ Why Choose Ronin Arms™ for Your MP5SD-K Conversion?

When you choose Ronin Arms™, you’re choosing true SD engineering—not shortcuts.

✔ Factory-correct SD architecture

✔ Titanium suppressor technology

✔ Compact SD configuration

✔ Smooth cycling and reduced recoil

✔ Precision craftsmanship backed by real-world testing

✔ Purpose-built SD components

✔ Hand-built attention to detail

✔ Live-fire verification before shipment

Every conversion is individually built, fitted, tested, and inspected before leaving the shop.

❗ MP5SD-K Compatibility — READ BEFORE ORDERING

The Ronin Arms™ MP5SD-K Conversion is designed specifically for FULL-SIZE MP5 receivers and full-size MP5 clones.

This conversion transforms your existing full-size MP5 platform into a compact SD-K configuration utilizing our proprietary 5.75″ ported SD-K barrel and 8″ Titanium Wakizashi suppressor.

✔ Compatible Full-Size MP5 Platforms

Ronin Arms™ SD conversions are compatible with full-size MP5 receivers and full-size MP5 clones, including:

• HK MP5 (MP5, MP5-N, MP5-F)

• HK SP5

• AP5 (AP5, AP5 Core)

• Zenith ZF-5 Series

• MKE Z-5RS

• MKE Z-43

• PTR 9R

• PTR 9CT

• PTR 9C / Classic

• PTR 9FR

• POF MP5 (Full Size)

• Dakota Tactical D54 Series

• TPM Builds

• Brethren Builds

• RDTS Builds

• Omega Full-Size Receivers

📌 General Rule: If it is a full-length MP5 receiver and not a K-model, it is compatible.

🔥 MP5K, SP5K & K-Variant Owners

Ronin Arms™ now offers a dedicated:

MP5K to MP5K-SD Conversion

If you own:

• HK MP5K

• HK MP5K-N

• HK SP89

• HK SP5K

• HK SP5K-PDW

• AP5-P

• AP5-M

• PTR 9KT

• Zenith ZF-5P

• Zenith Z-5P

• Zenith Z-5K

• POF MP5K Variants

• Any PDW, Micro, K, or K-N Receiver Platform

Please select the MP5K to MP5K-SD Conversion product page instead.

The MP5K platform utilizes a different conversion process and receiver-specific modifications than our traditional MP5SD and MP5SD-K conversions.

🔧 What’s Included in the Ronin Arms™ MP5SD-K Conversion

🗡️ 8″ Titanium Wakizashi SD-K Suppressor

Purpose-built for compact SD performance.

✔ Aerospace-grade titanium construction

✔ Elite-level sound suppression in a shorter package

✔ Optimized internal volume for SD-K gas management

✔ Reduced weight compared to traditional SD suppressor designs

✔ Estimated service life: 40,000–50,000 rounds

✔ Balanced handling characteristics

✔ Built specifically for Ronin Arms™ SD systems

🔩 5.75″ MP5SD-K Ported Barrel

Designed specifically for the SD-K configuration.

✔ Precision porting reduces standard 115gr and 124gr ammunition to subsonic velocities

✔ Eliminates the need for expensive heavy subsonic ammunition

✔ Professionally installed and head-spaced

✔ Optimized for reliability, accuracy, and longevity

✔ Engineered specifically around the SD-K suppressor system

⚙️ Additional Authentic SD Components Included

(All other components remain identical to the full-size MP5SD conversion)

✔ SD barrel shroud and cover

✔ SD cocking tube and support

✔ TIG-welded reinforcement at critical stress points

✔ High-temperature sealing ring

✔ 120° SD locking piece

✔ SD front sight with sling loops

✔ HK factory black finish

These components work together to create a complete SD system rather than simply attaching a suppressor to an existing firearm.

⚠️ Ammunition Requirements (IMPORTANT — READ CAREFULLY)

The Ronin Arms™ MP5SD-K system is engineered around standard-pressure ammunition.

✅ Approved Ammunition

115gr 9mm Ball

124gr 9mm Ball

These loads are intentionally slowed by the SD-K ported barrel to achieve consistent subsonic performance.

❌ Ammunition NOT Supported

❌ 147gr ammunition or heavier

❌ Synthetic projectiles

❌ Polymer-coated projectiles

❌ Frangible ammunition

❌ Coated or plated bullets

❌ Subsonic-labeled ammunition

❌ Reloads

❌ Non-SAAMI specification ammunition

📌 Heavier projectiles provide no benefit in an SD system

📌 Synthetic and coated rounds dramatically increase fouling

📌 Improper ammunition selection may cause cycling issues and accelerated wear

Use of unsupported ammunition is not covered under warranty.

🛠 MP5SD-K Conversion Process

1️⃣ Complete disassembly and inspection

2️⃣ Removal of factory barrel

3️⃣ Installation of 5.75″ Ronin Arms™ ported SD-K barrel

4️⃣ Integration of SD components

5️⃣ TIG welding at all structural points

6️⃣ HK factory black finish

7️⃣ Live-fire testing for function and suppression

8️⃣ Final QC inspection before shipment

Every conversion receives individual attention throughout the entire build process.

📐 Technical Specifications

Suppressor: 8″ Titanium Wakizashi SD-K

Barrel Length: 5.75″ Ronin Arms™ Ported SD-K Barrel

Locking Piece: 120° SD Specification

Estimated Suppressor Life: 40,000–50,000 Rounds

Maintenance: Factory Rebuild Available

Finish: HK Factory Black

📦 Shipping & ATF Transfer Information

✔ Ship ONLY your barreled receiver and bolt carrier group

✔ Printed order receipt required

✔ Suppressor transferred via ATF Form 3 to your FFL/SOT

✔ Original factory barrel returned with completed conversion

🚫 Do NOT send extra parts (stocks, trigger packs, optics, accessories)

⚠ $50 handling fee applies to unnecessary items received

⚠ Return of unnecessary items is not guaranteed

⏳ Build Time & ATF Notes

Estimated Build Time: 6–10 Weeks

ATF processing times remain outside of our control.

⚠ Status calls do not accelerate the process.

Every conversion is built in batches and individually inspected before shipment.

🔐 Refund & Cancellation Policy — ALL SALES FINAL

All Ronin Arms™ products are custom-built or custom-fit to order.

❌ No cancellations

❌ No returns

❌ No refunds

❌ NFA items are non-refundable

❌ Conversion services are non-refundable

Please confirm platform compatibility and ammunition requirements before placing your order.

🔓 Compact SD Performance — No Compromises

Shorter. Lighter. Faster handling.

The Ronin Arms™ MP5SD-K delivers the legendary MP5SD experience in a more compact package while maintaining the craftsmanship, suppression, and reliability expected from a true SD platform.

Same receiver.

Same craftsmanship.

Same SD performance.

Shorter system.

👉 Order your Ronin Arms™ MP5SD-K Conversion today and join the Ronin Family.

“Accept No Imitations. One Gun. One Gunsmith.”™