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Monocore Model

The ultimate rimfire suppressor! Designed to reduce the gunshot noise of any small rimfire calibre rifle, from .22lr and .17Hm2, to .22 Magnum and .17HMR. Compact, strong and durable, yet can be easily dismantled for cleaning by the shooter – an extremely important feature. No springs or loose baffles or spacers to worry about, and no chance of any problems with reassembly or baffle misalignment. The 1-piece (mono-core) baffle unit can only be installed one way, so reassembly is fool-proof. Proprietary ‘SSS-B’ monocore design provides outstanding gas turbulence and cooling effect, and can be replaced as a separate part if wear or damage occurs.

Why waste your money on a permanently sealed rimfire suppressor?  To maintain optimum performance, the rimfire suppressor should be cleaned every 300-500 rounds – especially if using a lot of .22LR subsonic ammo – to remove any excessive powder/lead fouling build-up.

Note: As with any suppressor, this unit will not fully silence High-Velocity (supersonic) ammunition. No suppressor in existence can remove the super-sonic crack of a bullet breaking the sound barrier. (This sonic crack of the bullet itself when measured at ‘milspec muzzle’ location can be in the 125 – 130dB(A) range depending on calibre and bullet velocity.)  True silenced performance is only achieved with subsonic .22LR ammunition.


  • 5.9“ long, 190 grams, Ø 1 3/8 “ (Ø 35mm)
  • Calibre: Designed mainly for .22LR.     (This model may be suitable for occasional use with .22 Magnum, .17Hm2, or .17 HMR – but for regular or commercial use with these cartridges we recommend the ‘Varminter’ model suppressor instead.)
  • Thread options: ½ – 20, ½-28, M14x1.0mm, 9/16-24, M15x1.0mm, 5/8-24, M17x1.0mm, M18x1.0mm, ¾-28, M20x1.0mm, 7/8-28
  • Improved pressure-vessel design.
  • Stainless steel threaded muzzlebrake/diffuser absorbs the brunt of the high-temp gas blast as it exits the muzzle. This gas is directed into the primary expansion chamber, initiating significant turbulence before the propellant gas reaches the main mono-core system.
  • Self-tightening design (Unit will not shoot loose, gas-torque feature keeps it slightly snug) – extremely important feature for muzzle-can units.
  • Removable mono-core baffle system, generates outstanding turbulence/suppression effect. (Proprietary design.) Precision-machined from solid 7075-T6 aircraft/weapons grade aluminium.
  • Black anodised. Unique design is the result of extensive testing, and tests show significantly better performance than some competitors much longer and heavier rimfire suppressors.
  • Precision cut-knurled front end-cap for easy removal and re-assembly.
  • Replacement mono-cores are available for purchase in the event of damage, or any excessive wear developing due to very high volume (or commercial) use.
  • Supplied with a 6”long Ø8mm plastic Delrin™ rod (core removal tool), and a textured rubber cover sleeve at no extra charge.  (See accessories section if you wish to purchase extra replacements in the event that they may be lost or damaged).
  • 100% Designed and Made in New Zealand.
  • Price (at Feb 2022): $180.00 (incl GST). Fitting costs (if required) are additional.

No Export Sales – all sales are for the New Zealand domestic market only.

Monocore Sound Test Data:

Explanation of Sound Test Results

Note that because the test data in the top half of the results was obtained using a semi-auto .22LR rifle (blow-back action) there is a certain amount of noise coming from the action (i.e. bolt slam, gas escape of out the ejection port, etc.) which would not occur on a .22LR bolt action. In that case the ‘shooters ear’ peak readings would be alot lower.  So what we are saying here is that these results may not be truly indicative of the performance of the suppressor, as the meter/mics may be capturing the peaks of the action noise rather than the peaks of the propellant gas noise signature. (We will explain about this a bit more in the centerfire suppressor tests.)

By way of reference, a simple medium-force ‘clap’ of your hands can be in the 120-125dB range (approx. 300mm from the mic), and a centerfire ‘dryfire’ of a rifle has been recorded at about 123dB in some reference videos that we have seen.  With more tests we will be able to determine (for reference purposes) just what the action noise is for the Ruger 10/22, and run some tests on a few bolt actions as well and post those results as soon as we can.

The results for the bolt action (on a different day) also had a longer barrel, so the muzzle readings and % of sound reductions are a bit lower, due to the longer barrel.  (i.e. shower barrels are always ‘louder’ with the same ammunition fired.)