Ronin Arms MP5SD-K Integrally Suppressed Conversion

Build Time: 2–4 Months | Hand-Built Precision | Made in the USA

Experience true MP5SD performance in a shorter, more compact SD configuration — without changing receivers.
The Ronin Arms MP5SD-K is not a different platform, not a receiver conversion, and not a compromise. It is a compact SD configuration built on the same full-size MP5 receiver, using a shorter barrel and suppressor system while retaining the same craftsmanship, process, and reliability standards as our full-size MP5SD.

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

The MP5SD platform is legendary for a reason: exceptional suppression, smooth recoil impulse, and unmatched shootability. The MP5SD-K configuration delivers that same SD experience in a shorter overall package, while maintaining the integrity of the original system.

Ronin Arms’ MP5SD-K Integrally Suppressed Conversion transforms your standard full-size MP5 into a compact SD system, featuring a shorter titanium integral suppressor and optimized ported barrel — all built under our One Gun. One Gunsmith. philosophy.

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

This is a professional-grade MP5SD-K conversion trusted by shooters who want true SD performance in a more compact form.

✅ 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 integral suppressor technology
✔ Shorter overall SD system without sacrificing reliability
✔ Smooth cycling and reduced recoil
✔ Precision craftsmanship backed by real testing

❗ MP5SD-K Compatibility — READ BEFORE ORDERING

🔒 Ronin Arms does NOT convert receivers.
🔒 All MP5SD-K conversions require a FULL-SIZE MP5 receiver.

✔ Compatible Full-Size MP5 Platforms

Ronin Arms SD conversions are compatible with full-size MP5 receivers and full-size MP5 clones, including:
- HK MP5 (Full Size) — MP5, MP5-N, MP5-F
- HK SP5
- AP5 (Full Size) — AP5, AP5 Core
- Zenith (Full Size) — ZF-5 Series
- MKE Full-Size Models — Z-5RS, Z-43, etc.
- PTR Full-Size Models — 9R, 9CT, 9C/Classic, 9FR
- POF MP5 (Full Size)
- Dakota Tactical Full-Size Builds — D54 Series
- Other Full-Size Builders — TPM, Brethren, RDTS, Omega (non-K)
General Rule: If it is a full-length MP5 receiver (not a K-model), it is compatible.

Not Compatible — K-Receivers & Variants

The following platforms cannot be converted to an SD system:
- HK MP5K / MP5K-N
- HK SP89 / SP5K
- AP5-P, AP5-M
- PTR 9KT / all K variants
- Zenith ZF-5P / Z-5P / Z-5K
- POF MP5K variants
- All PDW, Micro, K, or K-N receivers

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

🗡️ 8” Titanium Integral SD-K Suppressor

Purpose-built for compact SD performance.

✔ Aerospace-grade titanium construction
✔ Elite-level sound suppression for a shorter SD system
✔ Optimized internal volume for SD-K gas management
✔ Estimated service life: 40,000–50,000 rounds
✔ Balanced to maintain MP5 handling characteristics

🔩 5.75” Ronin Arms 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 heavy subsonic ammo
✔ Professionally installed and head-spaced
✔ Optimized for reliability, accuracy, and longevity

⚙️ Additional Authentic SD Components Included

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

SD barrel shroud & cover — correct SD profile
SD cocking tube & support — TIG-welded for strength
High-temperature sealing ring — improved efficiency and reduced fouling
120° SD locking piece — smooth recoil impulse
SD front sight with sling loops — functional and historically correct

⚠️ 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, polymer, or frangible projectiles
❌ Coated or plated bullets
❌ Subsonic-labeled ammunition
❌ Reloads or non-SAAMI-spec ammo

📌 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

📐 Technical Specifications

Suppressor: 8” Titanium Integral SD-K
Barrel Length: 5.75” Ronin Arms Ported SD-K Barrel
Locking Piece: 120° SD spec
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)
⚠ $50 handling fee applies; return not guaranteed