Have a crossman 1077 airgun but when I put in the CO2 cartrige it empties the gas. Used very little. Is there a home remidy or send it out to fix.

the sealing gasket is probably old and dry rotted from sitting around for so long

Here is the link to all the user manuals for Crossman pellet rifles
http://www.crosman.com/airguns/service/manuals/crosman-rifles
by your description you want the manual for the CS1K77
Please let me know if this is the correct manual?

Click here for the parts list and exploded view diagram showing internal schematic:
http://www.crosman.com/pdf/manuals/C357%20EVP%20&%20PL2.pdf

And here's the owner's manual:
http://www.crosman.com/pdf/manuals/crosman/357/C357-OM1.pdf

Best of luck!

well is the clip falling out

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.

Some air gun problems are an easy fix, some require extensive presses and jigs to move springs around. Most are not to messed with. I know, I have tried my best to repair an air rifle or two and had to send them back to the company to get them fixed. And there is nothing I can't fix, I have a big machine shop, been gun smithing for years and couldn't fix a little air rifle. Check out this website, it might help you, or steer you in the right direction. ,,,,,,,http://www.airguns.net/faq.php#faq1

Try this http://www.crosman.com/airguns/service/manuals/crosman-pistols

Here is a link to the entire Crosman manual. Scroll down the page to the 160 model and download the owner's manual free.

http://www.crosman.com/airguns/service/manuals/crosman-rifles

Check out www.mac1.com. Tim is one of the best airgun tuners around and can fix and/or improve your gun.