MPX-SD Fullsize Conversion Service

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4 in stock

During checkout, please ensure that you select an FFL (Federal Firearms Licensee) that permits suppressor transfers (SOT). Failure to do so may result in an additional $25 processing fee for us to arrange an eligible FFL on your behalf.
Military and LEO, please contact us to claim your 5% discount.

*Current 3 week turn times upon receipt of  the Barreled Upper Receiver.

MPX-SD Full-size Conversion Service. Includes 5.75″ Ronin Arms Ported SD barrel, Ronin Arms 12″  SD suppressor. Also included is barrel installation service and receiver machining to clearance suppressor on upper receiver.

This is a service for MPX owners!
We are not offering full MPX-SD builds at this time. Buyer will need to provide a barreled MPX upper receiver for service to be completed. This service is available for both Gen1 and Gen2 MPX models.

We CAN NOT convert models with monolithic upper receivers.
On all conversions we suggest getting a Midwest Industries handguard upgrade to clearance the suppressor.

IMPORTANT:  It is crucial to note that no extra parts or accessories should be included in the package. Sending additional parts may incur a charge of $50, and there is no guarantee that these parts will be returned. For the SD conversion, we only require the barreled MPX upper receiver. Please exclude charging handles, handguards, bolt carrier groups, sights, or any other accessories. We will send you shipping instructions once order is complete.


All instructions must be thoroughly read and comprehended. Ronin Arms LLC guarantees to the retail customer that this suppressor is devoid of any defects in workmanship and/or materials, and that it meets or surpasses all manufacturing specifications. This warranty solely covers repair or replacement at our discretion for this suppressor. DO NOT SHIP ANY SUPPRESSORS back to us. Contact us before any return is attempted or shipped! To follow legal requirements, you must not ship your suppressor to us until we have reviewed your situation. A SERIAL NUMBER CANNOT BE TRANSFERRED TO A NEW SUPPRESSOR OR TUBE. There are no other warranties, whether expressed or implied. There is no warranty for the merchantability or fitness of this suppressor for specific purposes. Specifications and/or designs may be subject to change without prior notice. This warranty does not encompass careless handling or use, negligence; improper handling or use, attempted, partial or complete disassembly, abuse; modifications; improper installation; ordinary wear resulting from normal use; use of improper ammunition, or any failure to adhere to instructions. Ronin Arms LLC shall not be held liable in any manner for any damages, personal injury or death, economic loss, or property damage. Suppressor is non-serviceable.


Ensure that the firearm is unloaded and the safety is engaged. Read all instructions provided on this page for this suppressor. Failure to do so may lead to severe injury or death! Always exercise extreme caution when handling firearms and suppressors!



Visually inspect and confirm that the firearm safety is engaged, verify that the firearm is unloaded, and remove the magazine if applicable. TO INSTALL: Ensure that the muzzle threads and caliber correspond to the suppressor specifications. Carefully thread the suppressor onto the threads at the rear of the barrel. Hand tighten. DO NOT OVER TIGHTEN. From the rear of the firearm, visually inspect the fitment of the suppressor attached to ensure that it does not obstruct the bore of the firearm. Never inspect bore alignment from the front of the firearm!


ONCE THE SUPPRESSOR HAS COOLED TO ROOM TEMPERATURE, unscrew the suppressor by hand. If necessary.


Barrel Length


Suppressor Length



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