Where do I put the co2 in my f4 air rifle - The Optics

Question edited for clarity.
Question moved to a Daisy category. Please always include the model.

You need a set of o-rings and seals for it. Try Pyramid Air.

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It is a break barrel air rifle that when it is cocked the piston is pushed back drawing air into the cylinder so that when the barrel is closed the breach seal covers the transfer port squeeze the trigger piston flies forward forcing the air through the transfer port into the barrel accelerating the pellet up the barrel and towards the point of impact
It is not a co2 powered air weapon

i am almost 100 percent sure that it is just a seal, CO2 is bad for drying out seals. Replace the seal and see if that fixes the problem, and if it does, go get some oil for firearms and put it on the seal before every 3 CO2 canisters.

You might have a bad O ring. I keep hearing a leak out of 990 and i think its from the coldness of the Co2. Every time i put Co2 in it it gets worse.

The Phantom Break-Barrel does not use CO2. It is a spring-loaded break-barrel weapon. If you really do have a CO2 gun, check the rubber seal around the outside of the cartridge puncture needle.

Probably not by you, but by the shop, maybe. It sounds like the needle was bent and lost it's seal. Crosman has repair stations, if they don't fix it, they will send you another one. I have sent them guns before and got brand new ones instead of the old piece of junk I sent them for repair. They also bought out Sheridan/ Benjamin line of Air rifles, And they repair all those too. I sent them an ancient rifle, an old Benjamin Franklin,17 cal. bare bones stock and barrel only, they sent me back a total refurbish, welded, painted, new .22 cal.barrel, all new guts, unbelievable. I think the total cost was $35 on that one. They wanted $15 for paint, I told them I didn't want it painted, they said, OK, Get a hold of them. Hope this helps.

You need to check the rubber o-ring seals both in the plug and there could be another up in the gun where the cartridge end meets the inside. If you have a broken o-ring you should be able to find one that fits at your local hardware store or store that sells air rifles. Hope this helps.

the gasket on the gun is probably bad

Check thare is a rubber o ring missing or broken in the air chamber