Madbull Powder Mine security ring

Security ring for the Madbull Powder Mine.
Bought mine here (germany) :
http://www.wolf-gear.de/airsoft/minen-granaten/mine-madbull/#cc-m-product-8179431986

Yeah, its a terrible basic thing to upload, but well - as soon as i lost the ring it will be to late to take the measurements ;-)

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