Never skirmished with but some natural rubbing around the top end of the mag from where it's been used in plinking. I've just tested it as gas tight and will make a video demonstrating this just prior to sending, but as I will need to de-gas to post, leaks can always develop. However most of the time these can be resolved by lubricating the valve and seals.

Stated price includes postage and PayPal fee. Please ask any questions via PM, as I don't get notifications for anything added to the listing.