🗡️ AP5-SD K Integrally Suppressed Conversion by Ronin Arms™

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

⚠️ IMPORTANT CONVERSION INFORMATION

“In Stock” does not mean ready to ship. It means we have the required components available and can place your AP5-SD K conversion into our active 2–4 month conversion queue.

Your AP5-SD K 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 AP5-SD K conversion requires individual gunsmithing, fitting, inspection, testing, and processing before it can leave our shop.

⚠️ YOUR LOCAL FFL HANDLES YOUR 4473 & FINAL TRANSFER

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 AP5-SD K 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.

✅ Why Upgrade Your AP5-SD with Ronin Arms™?

If you own a Century Arms AP5-SD , you already have one of the most compact and reliable roller-delayed firearms on the market, modeled after the legendary MP5-SD. But what if you could push its performance to the ultimate level—achieving whisper-quiet suppression, perfect cycling, and reinforced durability that outlasts the competition?

That’s exactly what you get with the Ronin Arms™ AP5-SD K Integrally Suppressed Conversion—an elite upgrade for operators, law enforcement professionals, and serious firearm enthusiasts who demand nothing but the best.

When you choose Ronin Arms™, you’re not just investing in a conversion; you’re securing:
✔ Industry-Leading Suppression Technology
✔ Expert Hand-Fitted Craftsmanship
✔ Premium Components for Maximum Longevity
✔ Rigorous Live-Fire Testing & Quality Control

❌ Models & Configurations We Do NOT Accept

To prevent delays or returns, please review the following non-eligible models and conditions:

• ❌ AP5 Standard (Full-Size) – Not compatible with this SD-K conversion
• ❌ AP5-P (K Receiver Models) – Cannot be converted into an SD platform
• ❌ Non-Century Receivers or Clone Variants – Only factory Century Arms AP5-SD is accepted
• ❌ Damaged, Altered, or Previously Converted Guns – No builds on compromised receivers or previously modified SD setups

📌 Before shipping your firearm, confirm your exact model to avoid delays and return fees.

🔍 What Is an Integrally Suppressed AP5-SD K Conversion?

This conversion replaces your factory barrel and shroud with a precision-engineered, integrally suppressed system. Unlike thread-on suppressors, an integral system provides:
✔ Superior Sound Reduction without unnecessary length
✔ Balanced Handling & Maneuverability
✔ No Point-of-Impact Shift during removal or reattachment
✔ True SD Authenticity for collectors and professionals

Perfect for:

• Tactical Operators & Law Enforcement who need stealth performance
• Home Defense Owners seeking reliability and sound suppression
• Collectors & Suppressor Enthusiasts demanding authentic SD builds

🔥 Key Features of the Ronin Arms™ AP5-SD K Conversion

New for 2025 – 8” Wakizashi Titanium Suppressor

The Wakizashi Titanium suppressor is the heart of this system, delivering:
✔ Aerospace-grade Titanium Construction – Ultra-light and incredibly strong
✔ Long Service Life – Estimated 40-50K rounds under standard use
✔ Easy Cleaning – Fully ultrasonic cleaner compatible
✔ Minimal First-Round Pop – Engineered for consistent suppression
✔ Perfect Balance – Eliminates excessive front-end weight

Ronin Arms™ 5.75” Ported SD Barrel

✔ Optimized gas regulation for subsonic performance
✔ Runs reliably with 115gr, 124gr ammo
✔ Installed and head-spaced by Ronin Arms™ experts

Complete SD Component Upgrade Includes:

• SD Cocking Tube & Reinforcement Support for smooth cycling
• Use your original locking piece and that’s what we head space off of.
• High-Temp Sealing Ring for gas retention and minimal carbon fouling
• TIG-Welded Barrel Shroud for unmatched strength

🛠 How the Conversion Process Works

1️⃣ Disassembly – We remove the factory barrel and SD components
2️⃣ Install Ronin Arms™ Barrel & Suppressor System – Precision fit for perfect cycling and sound reduction
3️⃣ Cocking Tube & Shroud Integration – Hand-fitted for factory-level alignment
4️⃣ TIG Welding & Structural Reinforcement – For maximum longevity
5️⃣ HK Black Factory Finish – A clean, corrosion-resistant coating
6️⃣ Live-Fire Testing & QC – Each build is thoroughly tested before shipping

Technical Specifications

• Suppressor: 8” Wakizashi Titanium (Integrally Suppressed)
• Diameter of Suppressor: 1.65
• Barrel Length: 5.75” Ronin Arms™ Ported Barrel
• Locking Piece: 120° HK Spec included in the AP5SD already
• Maintenance: No cleaning needed for 40–50K rounds — system actually gets quieter as carbon builds up; ultrasonic cleaning recommended at extended intervals
• Finish: HK Factory Black, corrosion-resistant coating

📦 Shipping & Transfer Information

✔ Ship ONLY: Barreled receiver & bolt carrier group
✔ Include: Printed order receipt (required)
✔ Suppressor Transfer: Processed via Form 3 to your FFL/SOT
✔ Original Barrel Returned: Included with your converted firearm

🚫 Do NOT send extra parts (stocks, trigger packs, optics) – A $50 handling fee applies, and these items are not guaranteed to be returned

⏳ Build Time & ATF Notes

• Estimated Build Time: 3–5 months (quality takes time)
• ATF Form 3 Transfer: Required for suppressor (we do not control wait times)
  ⚠ Calling for status updates will NOT speed up the process

🚫 Refund & Cancellation Policy

⚠️ All Sales Are Final

Because every Ronin Arms™ product — from full builds to suppressors, parts, and conversions — is hand-built or custom-fit to order:

• All sales are final on every item and service we offer.
• No cancellations, returns, or refunds once an order is placed.
• NFA items, custom builds, and conversion services are non-refundable.

We operate on a “One Gun. One Gunsmith.” standard of craftsmanship. Each order is scheduled, parts allocated, and work begins immediately to meet your timeline.

Please review your order carefully before checkout. If you have any questions or need clarification, reach out before purchasing — we’re happy to help ensure your order is exactly what you want.

✅ The Ronin Arms™ Advantage

✔ Specialized in SD Conversions – MP5, AP5, and advanced integrally suppressed platforms
✔ Crafted by Hand – No mass production shortcuts
✔ Premium Titanium Suppressors for ultimate performance
✔ Rigorous Live-Fire Testing for reliability under real conditions

🔥 Why This Matters for You

✔ Ultra-Quiet Shooting – Industry-leading sound suppression
✔ Compact Design – Perfect for CQB or discreet use
✔ Reduced Recoil – Smooth, controllable shooting
✔ Enhanced Value – Adds significant resale appeal
✔ Built to Last – Reinforced welds and premium components

✅ Order Your AP5-SD K Conversion Now

Ronin Arms™ conversions are in high demand, and we limit production to maintain quality standards. Don’t miss your chance to own the most advanced AP5-SD K integrally suppressed system on the market.