KMRNL Suppressor Cleaning Cap for TBAC GEN2 338 ULTRA & MAGNUS
The KMRNL Suppressor Cleaning Cap was developed to make suppressor soaking and carbon removal easier for owners of Thunder Beast Arms GEN2 338 ULTRA and MAGNUS suppressors. These GEN2 suppressors are designed to trap and hold gas for improved performance, which also means they can gain carbon faster than earlier GEN1 models.
This cap helps seal one end of the suppressor during the cleaning process, allowing the suppressor body to be filled with an approved cleaning solution and soaked upright. It is a simple, purpose-built cleaning aid made for shooters who want a cleaner, easier, and more controlled way to maintain their suppressor.
Helps seal the suppressor during cleaning so the tube can be filled with approved cleaning solution and soaked upright.
GEN2 338 ULTRA and MAGNUS suppressors trap and hold gas, which can cause faster carbon accumulation than GEN1 models.
Reduces mess during soak cleaning by helping contain the cleaning solution inside the suppressor.
Precision additive manufactured as a practical cleaning tool for serious rifle and suppressor owners.
Why It Exists
Modern suppressors work by trapping, slowing, and controlling expanding gas. The TBAC GEN2 338 ULTRA and MAGNUS are designed for improved suppression performance, but that gas management also means carbon can build up faster inside the suppressor compared to earlier GEN1 designs.
Over time, carbon buildup adds weight, reduces internal volume, and can make cleaning more difficult if ignored. Thunder Beast Arms recommends tracking suppressor weight and cleaning when carbon accumulation adds approximately 1 ounce over the suppressor’s original clean weight.
The KMRNL Suppressor Cleaning Cap was made to simplify that maintenance process. Instead of trying to clean around the suppressor or manage a messy soak setup, this cap helps seal the suppressor so it can be filled, soaked, drained, rinsed, and dried in a more controlled way.
Key Benefits
- Helps seal the suppressor during cleaning: Designed to assist with soak-style cleaning by containing approved cleaning solution inside the suppressor body.
- Useful for GEN2 TBAC suppressors: Intended for suppressors like the GEN2 338 ULTRA and MAGNUS, which can gain carbon faster because of how they trap and hold gas.
- Cleaner, more controlled soaking: Helps reduce spills and makes it easier to stand the suppressor upright during the cleaning process.
- Supports weight-based maintenance: Makes routine cleaning easier when your suppressor gains approximately 1 ounce over its original clean weight.
- Simple installation: Install the cap, fill with approved cleaner, soak, drain, rinse, and dry completely before use.
- Reusable cleaning aid: Built as a dedicated shop and bench tool for repeat suppressor maintenance.
- Compact and lightweight: Easy to keep with your cleaning kit, range tools, or suppressor maintenance gear.
- Made by KMRNL: Precision additive manufactured for practical use by shooters, hunters, and precision rifle owners.
Cleaning Use
Recommended Cleaning Process
- Confirm the firearm is unloaded and the suppressor is removed from the firearm.
- Weigh the suppressor and compare it to the original clean factory weight.
- Clean when carbon buildup adds approximately 1 ounce over the original clean weight, or as recommended by the suppressor manufacturer.
- Install the KMRNL Suppressor Cleaning Cap securely. Do not overtighten.
- Fill the suppressor with the manufacturer-approved cleaning solution.
- Stand the suppressor upright in a safe container in case of overflow, foaming, or leaks.
- Allow the suppressor to soak according to the cleaning solution and suppressor manufacturer’s guidance.
- Remove the cap, drain the suppressor, rinse as directed, and allow everything to dry completely before use.
- Repeat the cleaning cycle if heavy carbon buildup remains.
This cap is intended to make suppressor cleaning more manageable. It does not replace the suppressor manufacturer’s cleaning instructions. Always follow Thunder Beast Arms’ current guidance for your exact suppressor model and cleaning solution compatibility.
Important Safety Warning
Cleaning Use Only — Do Not Fire With Cap Installed
- This product is a cleaning aid only.
- Never install this cap on a suppressor while shooting.
- Never fire a suppressor with the cleaning cap installed.
- Always remove the cap and confirm the suppressor is fully drained, rinsed, and dry before reinstalling it on a firearm.
- Use only cleaning solutions approved for your suppressor’s materials and finish.
- Avoid harsh cleaners on exterior finishes unless approved by the suppressor manufacturer.
Fitment
- Product type: Suppressor cleaning cap / soaking cap
- Primary application: TBAC GEN2 338 ULTRA and TBAC MAGNUS suppressors
- Use: Suppressor soak cleaning, carbon maintenance, and cleaning-solution containment
- Installation: Hand-installed for cleaning use only
Use Case
The KMRNL Suppressor Cleaning Cap is ideal for precision rifle shooters, hunters, and suppressor owners who want an easier way to manage carbon buildup in TBAC GEN2 338 ULTRA and MAGNUS suppressors. It is especially useful for owners who track suppressor weight and clean when carbon accumulation reaches the recommended threshold.
Make suppressor cleaning cleaner and easier. The KMRNL Suppressor Cleaning Cap gives you a simple way to seal, soak, drain, and maintain your suppressor without overcomplicating the process.




























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