THESE SCREWS ONLY FIT DISCOVERY RIFLE MODELS. WE ALSO HAVE A 100-PACK LISTED IF YOU WANT A LARGER QUANTITY AT A BULK DISCOUNT.

CHECK OUT OUR HOW-TO DISCOVERY VIDEOS https://rumble.com/user/MagnumAirpower

 These screws are direct-fit for Discovery models with no modifications needed unless you are using one of our custom rifle groups or casings made of aluminum or brass or a pistol trigger frame, then you will need to file the bottom valve-screw to the contour of the bottom of the tube for the trigger group to mount over it, or you can leave a factory screw in that position, it doesn't lower the safety factor significantly to use one factory screw in the bottom position. You can leave the bottom screw position empty if using 2600 PSI or less.

They are designed by Magnum Airpower and custom manufactured, they are not available from any other source.  They safely raise the operating pressure to 3000 PSI. They are 410 stainless steel heat treated to meet metric class 12.9 with a specified hardness of HRc 39-43. The approximate tensile strength is 185,000 PSI. The head diameter is .3155", the head height is .0975" and the thread size is 8-32 x 3/16".

The second photo shows one of these screws holding a Discovery valve with 3300 PSI in the tube. The pressure on the gauge is clearly visible in the photo. This is the strongest screw set that exists for Discovery models. DO NOT PRESSURIZE A TUBE WITH ONLY ONE SCREW AS SHOWN IN THE PHOTOS, A LETHAL ACCIDENT COULD OCCUR. THAT DEMONSTRATION WAS DONE IN A CONTROLLED ENVIRONMENT BY HIGHLY EXPERIENCED PROFESSIONAL. ALL THREE SCREWS MUST BE USED TO HANDLE THAT MUCH PRESSURE SAFELY AND MAKING SURE ALL OF THE PARTS OF THE PRESSURE TUBE ASSEMBLY ARE IN SPEC, IN GOOD CONDITION AND ASSEMBLED CORRECTLY. These screws can handle much higher pressure than the fill adapter can, the safe pressure limit is based on what the fill adapter can handle with a minimum 3:1 safety ratio which is about 3000 PSI. With our custom fill adapter, assuming your tube is in spec, 3200-3300 PSI is safe.

 You will need a T25 driver to install these screws. They are designed to fit the threaded holes very snug when fully-installed. The last 1/64 of an inch requires a little extra force to get the screw head snug against the valve. Do not over-tighten, they should be hand-tight flush against the valve-body with no gap between the head and valve but no more torque than that is needed, be careful not to strip-out the threads in the valve, they are sometimes partially-stripped from the factory to begin with.

Message if you have any questions, making modifications to your airgun can be dangerous if not done correctly. Empty all air or CO2 pressure from your gun before installing these screws or a fatal injury could occur.

 Except for the original valve screws, the Discovery PCP tube assembly is as strong as the ones on similar Crosman/Benjamin 3000 PSI models like the Marauder Pistol and 1701P. All are made with of 1020 DOM steel tubing.