Hello, New to the site and am hoping to get some help. I ended up with a Crosman 400 repeater 20 some years or so ago. It always leaked the Co2. Finally dug it out with a couple other guns to teach my kids fun safety/use. Ordered some new seal for the 400 and in the process of taking the gun apart(new to this, never worked on a gun before) the magazine lock ball spring spring(part# 400-17) fell out. I later came to find out that there is also a magazine lock ball(part# 400-16), which must have fell out as well. Searched hi and lo in the garage and cannot find the ball. So my question, does anyone by chance know if there is somewhere to possibly get a new one, or possibly what is the size the ball? Amy help would be appreciated.
well that should be that hard, just measure then opening and that will tell you the ball and spring diameter and the spring would have to be longer then the opening length to put pressure on the ball or you could just get them here as long as the shipping doesn't eat you alive
so after calling Crosman the 2 parts are not there so you are back to measuring the hole for diameter and depth it is either a 3/32 or 1/8 ball and you would find something that will work 2.5mm could be in that range and can be gotten on Ebay from China and the spring also but you have to post that measurement for us' I'm not taken one of my 400's apart
well the OD of the spring or the OD of the hole minus a little will be your ball size seeing that it is a American made gun it will in inches and I would think either 3/32 or 1/8 and maybe a 2.5mm would work also you mention barrel but these 2 parts go in the breech block now you may have to buy a dozen to 100 balls to get one but that's just the price when parts go missing
So yeah, complete newbie. I went back to the manual after you mentioned the ball/spring going in the breech, not the barrel. I apparently wasn't paying close enough attention to where the manual showed them going and was thinking they went in a completely wrong spot. The lock ball was still in the breech. Again, thank you for the help, without that comment I might have wasted a whole lot more time. Next question, is removing the exhaust valve assembly and replacing seals a difficult task, if I pay more attention to the manual?...haha. I tried pushing(not too hard) the assembly out but it didn't want to budge. The valve set screw, hammer assembly and inner plug have all been removed already. Is there a specific way it should be done? Or is it maybe just stuck and needs some good pressure?