The plastic replacement part, in fact, has served the rifle better than the original material. The most notable was the change to a plastic receiver in place of a die-cast metal one. Over the rifle’s 30-year existence, the 760 has gone through several major modifications and design changes. It also has enough built-in accuracy for dad to use to discourage amorous night critters. It is a relatively inexpensive rifle, one that a youngster can afford. The Crosman 760 is one of the industry’s great air-rifle success stories. Don’t risk losing them.Īs working on the Crosman 760 is easier than the 375, I’ll discuss it first. Parts that are driven by springs and lost are easily replaced, but how about eyes? Replacement eye parts are difficult to find. While working on these air guns (and for that matter any project in the shop), the use of eye protection is highly recommended. A person starting in air-gun work can follow these detailed instructions point by point until familiarity with the working parts is developed. The basic cause of such wear is generally a lack of lubrication and excessive force.Īs air-gun work may be new to many, I will begin with an in-depth and detailed look at the disassembly and reassembly process. Parts affected by wear include the barrel seals on spring-loaded target guns and overtightened end seals of power cylinders. The second problem is caused by normal wear of parts that slide against each other during operation. The proper oils are silicone based and a small supply should be ordered from Crosman. Petroleum products will attack O-rings and seals, softening and expanding them, and destroying their usefulness and this could be another cause. Another cause is the use of regular gun oil. Although there are other causes of leaking, the major contributor is over lubrication. Once the valve seals have become scratched, a channel is opened for air to escape. These parts in air guns are the seals, valves, and O-rings. This sticky and abrasive mixture slows down moving parts and seems to gravitate to the parts that are most wear-sensitive. Dust and grit col-lect in the oil needed to lubricate sealing and operating parts. The first, and most common factor in air leak-ing, is over-lubrication. The 760 is charged by pumping air into a valve, storing it until needed for a single shot.Īll air guns, from the cheapest to the most expensive target models, have the common problem of leaking air.

The 357 uses a disposable CO2 container for multiple shots. In looking at the 357 and the 760, it can be seen that air is handled differently in each instance. What may be a problem, however, is the shift in thinking needed from “powder power” to “air power” and how air power is stored and handled. In fact, many air-gun parts look and function like their counterparts in firearms we’re already familiar with. The quantity of air-gun parts per gun is about the same or less than the number of parts in so-called normal firearms. The number of parts in the Crosman 357 is less than 60. This S&W revolver has about 80 individual parts. Perhaps the revolver most gunsmiths first became familiar with was the Smith & Wesson Model 10 or 19. A mechanical device is a mechanical device, and a ‘smith with any experience and savvy at all will soon gain a working knowledge of air-powered guns. What learning process was used to acquire knowledge about a Ruger 10/22 or any other firearm for that matter? Many learned by taking a firearm apart and seeing how the parts fit and interacted. Gunsmiths who don’t repair air guns should ask themselves, why not? Is it the image of air-powered products that have kept air guns out of the back room? Could it be a lack of knowledge, or even fear of the supposed complexity of the internal parts?

Crossman 766 repair manual