How to assemble a crosman nightstalker

Life sucks. Take it to a gunsmith or send it back to the factory for re-assembly.

The diameter of the bore/caliber is .177

or
.00177 of an inch

or

.0044598 mm

The outside diameter... the barrel is housed in a muzzle. You would need to physically measure or contact Crosman for those details

Best of Luck!

You need to contact a Crossman retailer to see if they make a kit, I really doubt they make parts for this.

Well I recently bought a crosman like a month ago, I worked great, I also use CO2, then i started using it again, and all of a sudden all of the CO2 started seeping out of the barrel and CO2 area, cartridge after cartridge, so i said screw it and took it apart, and found the area that deals with the CO2 and tightened everything up. I couldn't put it back together, so i looked for the schematics and finally got it back together, then i tested it out and it works fine now. Good luck.

well is the clip falling out

hi download pdf exploded view here.
http://www.crosman.com/pdf/manuals/RCT525%20EVP.pdf

Ya your better spending the extra money on something with quality

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

Try with this:
http://www.network54.com/Forum/275684/message/1136858902/nightstalker+research+pics+%28long%29

Regards.

ACA.