Hello together,
I am from southern germany and found this nice forum, congratulations for that. I would like to buy a used 1077 from a friend of mine but there is a question left: By german laws an airgun is limited to 7,5 Joule energy. That means approx. 175 meters per second velocity. For guns like Walther 850 we are allowed to buy "export valves", but we are no allowed to assamble them to the gun ;-)Same with paintball markers, only legal at 214fps but tournaments are played at 300fps...
So, my question is: Do you think the limit of 175m/s is even set by using another valve? Is there a online shop where I can buy spare parts like valves? Do you have any idea if and how it is possible to increase velocity?
By the way, I would not have the instructions to brake german laws, it is just for my information.
Thanks in advance,
Chris
chris, here's a site (http://www.crosman.com/airguns/service/manuals) where u can get the owner's manual & stock parts (buy them direct from crosman).... as for the after market valve suggest u contact joe mc (Joe McAllister <yourdaddyjoe@hotmail.com ) on this site as odds r he can help u out.... do u live near bochingen?.... best regards, pops
Thanks so far for the information! You think that the valve is the point where they limited the german 7,5J version?
I really live near Böchingen (about 10KM) and I can not believe that someone from overseas knows such a little village here in the south! Where do you know that village from? Did you stay here? What a contingency...
chris, not sure about the valve but it sounds right that it would control co2 & the fps..... contact joe mc as he can help you.... as for bochingen my grandfather & father born there (ich bin here geboren 1937).... at one time i had property there but i've lost track of the person who took care of the property & have no way of finding out what happened to the property.... if there's any way u can get me any information as to how i might find out i would appreciate it greatly.... thanks, & regards, john (pops)
Hi Chris, I just bought yesterday a 1077 at Big 5 here in Arizona. The funny thing is it has an "F-Stempel". As a German you know it is the requirement for a gun below 7.5 Joule, but it shoots with 625 ft/s or 190 m/s. I know this doesn´t help but you could import one from the US or get at least some spare parts. Viel Spass mit Deiner 1077. Grüsse aus Arizona. LG
Hi Chris, I'm in Canada and Crosman limits the power of our 1077 by restricting the gas flow at the valve. The full power valve has a black detent (The plastic part of the valve. Download the 1077's schematics from the Crosman web site. Our Canadian "de-tuned" (restricted power) valve detent is grey. You can see the detent when you remove the gun's magazine. Turn the gun over and look inside. You'll see the breech end of the barrel. Opposite that (towards the trigger) is the valve's detent. If it is not black, you have a restricted valve.
A full power valve and a restricted valve use the same amount of CO2. So the restricted valve is actually wasting gas.
If you have a grey detent on your valve, you can make it more efficient. To make the restricted valve more efficient, and this is just for information purposes only, remove the valve (there's a link to disassembling the 1077 in this forum somewhere, but I don't have it handy) and take off the detent assembly. You'll see that a groove where a rubber o-ring should be. Find a correct size o-ring on it. Then, see the size of the detent's hole. You can hand drill to increase it's size, use a 5/32 inch drill bit. This change will allow the CO2 to flow more better through the gun.
That's all that needs to be done. There are other modifications that can be made to the gun to give it more power, but this change is a good start.
Thanks for the very detailed instructions and the fast help. I think I will buy the gun and have a look at the valve... Just to be informed about the technical details of the gun
@pops: Please feel free to contact me by EMail and tell me how I can help you with your story. It would be a pleasure for me to catch some information for you. I am engaged at a political party and part of the town concil here, so it should be possible to get informations.
By the way: Airguns have restricted power in Canada, too? I always thought that the laws belonging arms and guns are nearly the same then in the states?
The only legal guns you can have in germany are teargas handguns and airguns restricted to 7,5J. Even Paintball is not allowed, actually only tolerated under hard obligations. German laws says that Paintball is glorifying war and will reduce the psychological barrier to shoot at someone. Even a licensed huntsman is only allowed to have two handguns (but unlimited rifles). German laws say that handguns have more "criminal potential"...
Very hard stuff for guys like me who like plinking and shooting for sport purposes...
This message has been edited by OF112 from IP address 92.226.139.223 on Jan 10, 2009 10:45 AM
All crosman 1077 valves are the same. The restriction comes from the detent plunger having different size holes. The smaller the hole, the more "restricted" the flow of CO2.
The valve detent plunger is part number 106A036. Notice also that part number shows 2 items. One item is a rubber o-ring. It will be missing from the "restricted" or "low-powered" or "de-tuned" 1077 rifle. Just find the right size o-ring from any hardware store.
Take a look at my post above for information on how the full powered and de-tuned rifle valves. The full powered 1077 has the o-ring and a larger hole in the detent plunger. The detent plunger hole can be increased in size by hand drilling it with the next size drill bit until you reach a maximum 5/32 inch drill bit. Going one drill bit size at a time helps ensure the hole stays centered.
As for the powerlet tube. It's just a tube that holds the CO2 powerlet and the piercing assembly part of the valve. It is under pressure but only because it is holding the CO2 powerlet against the valve. Once the powerlet is depleted, there is no longer pressure. Refer to the parts diagram, the piercing assembly valve is part number 1077A018.
