How to co2 bulk fill a Crosman 2240 2300 2250b 2400 pistol carbine

How to co2 bulk fill a Crosman 2240 2300 2250b 2400 ratty Bulk filling a Crosman 2240/2250 isn’t that hard. Several options possible. I’ll write about and show the way I converted my pistol and carbine. Links and parts list at the bottom. Do not use compressed air, the system is built for self-regulating co2 and cannot safely handle higher pressure. First got a CO2 extinguisher. These have a date after which they may not be re-filled anymore. The companies who supply them take them in and have to pay to