SHORT TANK BLOCK for Crosman 2240, 2250, 2260, 2300KT, 2400KT & Custom Builds

Description

This listing complies with eBay's air gun guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws - http://pages.ebay.com/help/policies/firearms-weapons-knives.html
THESE ADAPTERS DO NOT FIT COTHRAN TUBES. HE MAKES HIS TUBE-THREADS TO TIGHTER TOLERANCES THAN CROSMAN/BENJAMIN DOES. WE MAKE OUR ADAPTER THREADS OVERSIZED TO FIT CROSMAN/BENJAMIN TUBES TIGHTER. HIS TUBES ARE TOO TIGHT FOR OUR ADAPTERS.
This is the newer short version of our Magnum Tank Adapter machined from 7075-T6 aluminum. It mounts tanks up to 2" OD like most standard 13 cubic inch regulated HPA tanks. It threads directly into 7/8" OD tubes including 2240, 2250, 2260, 2300 series, 2400KT, Discovery, Challenger, Maximus, Fortitude, 1701P, 1720T, Marauder Pistol and many related models with the same size tubing and 13/16-28 thread size inside the front of the tube. The barrel-shroud shown in the photos is 7/8" OD and fits well with the tanks and cartridges this block is intended to be used with.
In order to use this tank block you need a bulk-fill/PCP style valve with a cap that seals against the tube instead of a 12-gram CO2 cartridge, this turns your tube into the pressure reservoir. If only using CO2 tanks, 88/90-gram cartridges or HPA tanks regulated up to 1200 PSI, your original valve and mounting screw will work if you replace your valve cap with one of our custom short caps, your original valve stem will work but our Discovery stem will work better. For pressures above CO2 or 1200 PSI you need to secure the valve as explained further below.
You can either drill the anchor-screw hole in the tube as described in the next paragraph or install it with threadlocker on the threads instead. The anchor-screw is the safer method and is recommended if you plan to pressurize the tube to more than 1200 PSI. It will thread past the point where it's straight so you thread it all the way until it touches the tube, then back it off a partial turn until it's straight. If the anchor screw is in the correct location it will be straight with the screw lined up with the hole. With threadlocker you get it straight with the tube lying on it's side and leave it until the threadlocker sets. Only use a tiny bit of medium-strength threadlocker or you will never get the block out without damaging it and/or the tube. A heat-gun may be needed to remove the block after the threadlocker has set, only heat enough to be able to turn the block, the less heat the better. Do not use a torch or any hearting method hotter than a heat gun, the tube can lose it's structural integrity if heated too much.
MARKING THE ANCHOR-SCREW HOLE LOCATION:
Thread the adapter all the way in, then back it out until it points straight down. Mark the center of the hole 1.015" (1-1/64") from the back of the block,
not the front of the tube.
Deburr the inner edge of the hole after drilling so the o-ring on the adapter doesn't get damaged during installation. If using the harder 90D o-rings, which it comes with, you need to tap the front of the block lightly with a rubber mallet, block of wood or your hand to get it started into the tube without pushing it past the anchor-screw hole, then push the o-ring under the edge of the hole with a small slotted screwdriver to prevent it from being cut or sometimes you can twist and push lightly to get it in safely.
The screw is T10 drive with a head diameter of .271". The hole should be .275" - .281" (9/32) to fit in a recessed fashion like PCP valve screws do.
This adapter can handle operating pressures far above the limits of your gun. The limit your gun can handle depends on how many valve screws you have and how strong they are. With three of our custom valve screws 3000-3200 PSI is a safe operating pressure limit. Maximus models with two custom screws can use up to 2400 PSI. For CO2 models you need to convert your valve to bulk-fill with our Magnum Valve for bulk-fill conversions, that's safe for CO2 and HPA tanks regulated up to 1400 PSI using a 1.8K burst disc on the regulator. You need to do some research to learn how to safely secure your valve before attempting to use this tank block or any other parts mentioned.
This listing is for one tank block with the o-ring and anchor screw, other parts and airguns are shown for reference only.