The end projects through the back when the gun is cocked, giving a visual “cocking indicator”, a nice safety feature. Top row on the left is the hammer (with cocking pin), next a new end plug for the main tube (drilled and tapped for the adjuster), and on the right the preload adjusting screw with locknut.īelow is the hammer spring, in this case riding on a spring guide which slides through the hollow adjusting screw. Here is the RVA above disassembled so you can see the component parts. It’s for the common “Disco” or 22XX series guns by Crosman. This allows us to change the hammer spring preload, and therefore PCP power output of the gun. Only relatively recently have some manufacturers started to provide some adjustability for the hammer strike, to allow us to “tune” or control PCP power to our needs.įortunately, in most cases, it is not too difficult to make a “rear velocity adjuster” (aka power adjuster, or RVA). Some, on the other hand (Big Bore manufacturers are often guilty of this) fit a heavy hammer spring to maximize the power, resulting in an “air hog”.
Manufacturers, realizing this, often fit a hammer spring that isn’t strong enough to reach maximum power, or is adjusted to avoid wasting that much air. Unfortunately, that wastes a large amount of air. As I mentioned previously to obtain maximum power, the valve must stay open until the pellet leaves the muzzle. In most PCPs the valve is opened by being struck by a hammer or striker, propelled by a compressed spring. In this article we will look at the other major way to alter or control PCP power – namely the hammer strike. That also gave a method to get a rough idea of the maximum FPE you might achieve with a given combination of caliber and port size, barrel length and pressure in a PCP airgun.
In my previous article I covered how changing the port size can be used to control PCP power.
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