I jam a rubber chair leg tip over the end of my knurled thread protectors to seal the barrel and also works in the safe to protect the crown when storing barrel down.
Keep barrel covered in the bush until you are ready to fit suppressor.
Several sizes available depending on OD of thread protector. Leave rubber chair tip on and just unscrew thread protector as usual. I wouldn't want to shoot through it though.
https://www.bunnings.co.nz/surface-g...-pack_p4050073
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