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If you have any questions, do not use this product and contact us for clarification.


What ammunition should I use with my SMPX?

  • The design of the SMPX allows you to use almost any factory ammunition that you want that is 9mm on down in size, velocity, energy and pressure, and is the correct ammunition for the firearm. Please contact us if you have any questions.
  • You can use standard velocity ammunition and still get subsonic results.

What is the effective range?

  • Your SMPX silencer gives you the same effective range of the Mp5 SD which is anywhere from 25-75 meters (up to 246ft).

Does the SMPX silencer void my firearm warranty?

  • The SMPX is a barrel modification only and should not void your factory warranty. We recommend reaching out to the firearm manufacturer for their specific warranty information.

What is my silencer warranty?

What is the “beyond” part of my silencer warranty? 

The beyond services are for the original SMPX owner with an approved Form 4 tax stamp and LE Agencies on a Form 5 but with limitations. 

  • If you have damage to your silencer caused by user error we will repair your SMPX one time at no charge if the serial number and tube are not damaged and it is repairable.
  • Once a calendar year you may send your silencer back to our facility for maintenance. We will clean and inspect your silencer at no charge. The only cost to you is the cost of shipping. This service DOES NOT replace the required cleaning and maintenance that you have to perform after every shooting session (not to exceed 300 rounds). If we feel that you are not performing the required cleaning of your silencer, we reserve the right to charge a fee for this service, or refuse to service your SMPX.
  • At your pleasure you may send your  silencer back to our facility for a core replacement. We will remove your current core and install a new one. There is a fee for this service that varies in price due to inflation and material costs. 
  • The first 12 months of owning your SMPX you will receive 10% off our barrel threading, pin/weld of I.A. silencers and Form 1 NFA engraving services. You will also receive 20% off apparel, and 15% off regular priced accessories in our online store. You will need to register your silencer here to receive these discounts.