Take a Look at Ronin Arms RA5SD, RA5SD-K, MPXSD, SD-K Conversion, RA9SD, RA9SD-K & Defcon4SD [Video]

Scott Richardson with Ronin Arms Showing off the Ronin Arms RA5SD, RA5SD-K, MPXSD, SD-K Conversion, RA9SD, RA9SD-K & Defcon4SD | CanCon 2024 Arizona

Ronin Arms offers a cutting-edge line of integrally suppressed firearms built on the MP5SD concept, modernized for today’s shooters. The RA5SD and RA5SD-K platforms deliver exceptional suppression using affordable 115 or 124 grain ammo—no need for costly subsonic rounds. Ronin also brings this performance to the SIG MPX with SD conversions, transforming any non-Copperhead MPX into a modern, suppressed system with 12-inch and compact 8-inch K models. The RA9SD and RA9SD-K offer the same SD performance in a custom AR9 platform built from precision-machined Glock mag lowers, with an easy conversion kit available for standard AR platforms. All Ronin SD systems keep 115/124 grain ammo subsonic before it exits the suppressor, delivering quiet, reliable performance across all platforms—including the versatile Defcon 4SD lineup.

Watch the video for in depth details!

Ronin Arms RA5SD Specs:

• Caliber: 9mm x 19 Parabellum. 
• Barrel Length: 5.75 inches. 
• Barrel Twist: 1:10 with 6 right-hand grooves. 
• Operation: Semi-automatic, roller-delayed blowback. 
• Suppressor: DEFCON 4 SD 8″ suppressor, designed for the Ronin Arms barrels and integrally suppressed systems. 
• Bolt Group: Tungsten-filled RCM bolt group, designed for reliability and smooth operation. 
• Receiver: Built using quality LSC receiver flats, precision-rolled and welded. 

Ronin Arms RA5SD-K Specs:

• Every RA5SD-K is meticulously handcrafted, ensuring elite performance, precision, and durability.

The Ronin Arms RA5SD-K is not a clone—it is an authentic, integrally suppressed MP5SD-K, built from receiver flats and precision-machined components.

Every detail is carefully engineered, hand-fitted, and tuned by one master gunsmith from start to finish. This is a purpose-built system, where the barrel, suppressor, and internal components work together seamlessly to deliver flawless function, superior accuracy, and elite-level suppression.

What’s Included in the Ronin Arms MPXSD:

6.75″ Ronin Arms Ported SD Barrel

• Reduces 115gr and 124gr 9mm ammo to subsonic speeds, eliminating the need for expensive 147gr rounds
• Features a precision-engineered porting system that minimizes recoil and enhances accuracy
• Includes an 18 x 1 rear thread pitch for secure suppressor attachment and broad compatibility

12″ Defcon4 Suppressor – Whisper-Quiet & Low Recoil

• Designed for extreme noise suppression with optimized gas flow
• Non-serviceable and maintenance-free, built to endure 40,000–50,000 rounds
• Rebuild service available to maintain peak performance over time

Elftmann Adjustable Trigger – Crisp & Responsive

• Fully adjustable pull weight allows for precise tuning
• Delivers enhanced trigger control for both tactical and competitive use

Battle Arms Development Ambi Safety Selector

• Ambidextrous design allows easy operation from either side
• Built with durable, smooth safety engagement for consistent performance

Radian Raptor Ambidextrous Charging Handle

• Effortless operation for both left- and right-handed users
• Precision-machined for long-term durability and reliable cycling

KNS Precision Anti-Rotating Pins

• Prevents wear and rotation in the fire control group
• Enhances the overall stability and longevity of the platform

Exclusive Cerakote & Custom Aesthetic

• Ronin Edition Exclusive Cerakote Finish
  • Custom hand-applied Cerakote, exclusive to the Ronin Edition
  • Provides enhanced durability and corrosion resistance
  • Available in premium colors for a personalized build
• Iconic Ronin Insignia
  • A symbol of elite craftsmanship and quality

Key Features of the Ronin Arms SD-K Conversion:

• Ported Barrel Technology:
  Similar to an MP5SD, the Ronin SD-K uses strategically placed barrel ports to bleed off gas and reduce bullet velocity. This means you can use common 115gr or 124gr 9mm ammo and still stay subsonic—no need for expensive 147gr ammo.
• Integrated Suppressor Compatibility:
  The system is designed around a suppressor that fits over the ported barrel, capturing and controlling gas in a highly efficient way. Often non-serviceable, these suppressors are built for high round counts (40,000–50,000+).
• Drop-In or Full Upper Kits:
  Some Ronin SD-K kits are complete upper conversions (ready to pin onto your registered MPX lower), while others may be barrel + suppressor combos intended for licensed builders.
• Shorter, Lighter, Quieter:
  The compact design keeps your platform short and maneuverable, while quieting supersonic ammo to subsonic levels and reducing felt recoil.

Key Features of the Ronin Arms RA9-SD:

• Integrally Suppressed Design: The RA9D Full Size features a 12″ integral suppressor paired with a 5.75″ ported barrel. This configuration brings standard 115gr 9mm ammo to subsonic speeds before the round leaves the chamber, resulting in an extremely quiet shooting experience.
• Caliber: 9mm
• Barrel Length: 5.75″ ported barrel
• Suppressor Length: 12″ integral suppressor
• Overall Length: Compact SBR design
• Compatibility: Designed to work seamlessly with various platforms

What’s Included in the Ronin Arms RA9SD-K:

5.75″ Ronin Arms Ported SD Barrel

• Reduces 115gr and 124gr 9mm ammo to subsonic speeds—no need for expensive 147gr subsonic rounds
• Precision-engineered porting system for reduced recoil and superior accuracy
• 18 x 1 rear thread pitch for compatibility and secure attachment

8″ Defcon4 Suppressor – Compact, Ultra-Quiet & Built for Performance

• Designed for extreme noise suppression and superior gas efficiency
• Minimal blowback for cleaner function and smooth cycling
• Non-serviceable design rated for 40,000–50,000 rounds – contact us when servicing is needed
• Lightweight yet durable, providing superior suppression while maintaining optimal handling

Elftmann Adjustable Trigger – Crisp & Responsive

• Fully adjustable pull weight for precision shooting
• Enhanced trigger control for both tactical and competitive applications

Battle Arms Development Ambi Safety Selector

• Ambidextrous design for fast and reliable operation
• Smooth, responsive safety engagement built for durability

Radian Raptor Ambidextrous Charging Handle

• Easy operation for left- and right-handed users
• Precision-machined for enhanced durability and smooth cycling

KNS Precision Anti-Rotating Pins

• Prevents wear and movement of fire control components
• Reinforces the overall stability of the platform

Ronin Edition Exclusive Cerakote Finish

• Custom hand-applied Cerakote – only available on Ronin Edition firearms
• Enhanced durability & corrosion resistance
• Premium color selection to personalize your build

Iconic Ronin Insignia

• Mark of master craftsmanship & elite quality

The Ronin Arms DEFCON4-SD Suppressor System

Ported Barrel + Suppressor Combo

• Pairing a precision-drilled ported barrel with a Defcon4 SD suppressor creates a smooth, compact, and tucked-in integrally suppressed package.
• Both short, 8″ and full‑size 12″ configuration
• Subsonic from Standard Ammo: Barrel ports bleed off gas, slowing typical 115–124 gr 9mm rounds to subsonic velocity—no need for pricey 147 gr subs.
  

The Ronin DEFCON4‑SD delivers a modern, MP5‑SD‑style suppressor system that is well-engineered, beautifully integrated, and praised for performance. Ideal for anyone building a quiet, compact 9mm platform using standard ammo—perfect for tactical setups, range builds, or competition rifles.

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