Instructions for Kaimai® Varminter Suppressor – Use and Care

    • Thank you for purchasing one of our high quality Rimfire suppressors. This model is designed for use with .22LR subsonic or super-sonic ammunition, .22 Magnum, .22 Hornet, and the .17HMR, .17WSM, and the .17 Ackley Hornet. (NOTE: The ‘.17cal ONLY’ version must not be used on .22cal. rifles, due to obvious risk of bullet strike on the baffles.)
    • This model does incorporate a self-tighten muzzlebrake feature, but for most rimfire rifles with a snug fitting thread there should be no issues with the suppressor working loose by itself.
    • Remove the suppressor from the rifle when not in use. Store it separately from your firearms, and in a well-ventilated area so that ambient air can pass freely through it. During our product R&D process we pulled our prototype suppressors apart soon after firing for inspection and were astounded at the amount of condensation (moisture/water) build-up on the surfaces of the internal components. Having a moisture reservoir permanently attached to the end of your barrel can actually promote rust/pitting formation in the recently fired (or dry) rifle bore. If the rifle is stored in a vertical position with the suppressor attached carbon/powder fouling may also tend to migrate down into the bore. We recommend removing the suppressor from your rifle when cleaning, install a thread protector cap and store the suppressor on top of your gun safe or an open shelf where air car move through it freely.
    • Apply a light film of grease or gun oil onto the barrel threads regularly

. Do not allow threaded joint to become dry, damaged or dirty.

  • Your KAIMAI® Varminter suppressor should be installed and checked by a qualified gunsmithor approved/competent fitter/machinist, with the necessary skills and specialist gunsmithing tools and equipment to do the job correctly and to a high standard. Sub-
    standard fitting work may result in damage to the suppressor, poor performance/accuracy problems, and may void the warranty.
  • If you are installing the suppressor yourself onto a factory-threaded muzzle thread, then you will need to check the alignment of the suppressor to the bore of your rifle to be 100% sure of correct barrel-bore to suppressor-bore alignment BEFORE firing a shot though the unit. Some factory muzzle threads are not always done to a high standard, and alignment issues due to sloppy threading jobs can and do occur. It is your responsibility to check the silencer alignment before using the rifle, as there is no warranty claim for damaged suppressors due to barrel thread alignment issues, or other misadventure or misuse.

  • KAIMAI® Varminter suppressorscan be field-disassembled for cleaning. This is extremely important when using the suppressor on .22 LR rifles with subsonic ammunition, as un-burnt powder and lead deposits will accumulate inside the suppressor, and this will need to be cleaned out periodically to ensure that the suppressor continues to function as designed and that the baffles do not become excessively clogged with fouling.


  • IMPORTANT: After cleaning the suppressor unit and baffles, apply a light smear of automotive grease on the inside the tube.  This will aid in reassembly and help to prevent the baffles and o-ring seals from getting stuck fast when the powder fouling dries or the rubber o-rings ‘set’ up tight against the inside of the tube.

Some important points to consider:

  • Fouling in the rimfire suppressor may become dried and cement-like, which can make the baffle-stack stubborn to remove.
  • The fouling can contain lead powder, which can be potentially dangerous to human health if inhaled or ingested. Ensure that when cleaning the suppressor you use protective rubber gloves and undertake the cleaning process in a well-ventilated area.

  • The suppressor external parts are black-anodised. The mid-baffles are 300 series stainless steel. Washing and light scrubbing with kerosene or standard parts-cleaning solutions may be used. Warm dishwashing liquid solution may also be used. If the fouling is stubborn allow the parts to soak for a few hours before scrubbing clean. Do not use brushes with metal bristles. Brushes with plastic bristles should be adequate and should not mark the parts. With proper use & care these suppressors with stainless internals should last a lifetime, or longer.
  • DO NOT USE Ultrasonic cleaning system. (This may damage the anodising finish).
  • If using kerosene or other flammable solvents, be sure to allow plenty of time for the parts to dry off so that there are no solvent fumes remaining before the unit is reassembled and fired.
  • Carefully tighten the front end cap with the special installation/removal tool. It is best to securely hold this tool in a bench vice, then hold the suppressor against the 6-pin tool, and rotate the suppressor while the tool remains stationary in the vice.
  • The rear end piece of the suppressor (and the threaded stainless muzzlebrake) are loctited permanently in place – DO NOT attempt removal of these parts.
  • There are 4 rubber O-rings suppied with each Varminter suppressor, and these must be located in amongst the 5 mid-baffles of the assembly only. Take care when re-installing the barrel stack (with o-rings in place) back into the suppressor, and ensure that the baffles are facing the correct way around.

(Replacement O-ring size: M25x1.5 N70)


  • Always use firearms safely. Consult your gunsmith for any maintenance or repairs.