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Stop the bleeding!
These are the parts and tools you need for this trick. We believe monkeys could be trained to use these!
BBQ the heat-shrink tubing.
Check the length, match with the step in the nozzle.
Finish at a slight angle to allow a bit of bleeding. Easy to get right after a couple of times.
Tokyo Marui 1911 magazine being filled with the new part. Works like the old-fashioned lavatories in trains!

With the invention of O-rings in the fill valves a few years ago, Taiwan manufacturers have commonly adopted this feature to their gas powered models. For those who have not had the pleasure to handle various GBB pistols: The magazines of pistols from KJW, HFC and such are commonly equipped with an extra O-ring in the fill valve, to prevent gas from being wasted when you fill the magazine.

Tokyo Marui and other Japanese makes have not adopted this feature, for one reason or another. The extra O-ring has received criticism because of the fact that it's hard to tell when a magazine is full, and sometimes the back pressure may keep liquid from going into the magazine, save for a small spurt.

 

TIME FOR ANOTHER DIY-FIX!

While there have been some guides how to add this feature to your existing magazines, there's always the risk of hindering the operation of the valve with too much superglue or a seal of the wrong size. And if you have a few magazines for each pistol you own, as well as 40 mm shells, it may take time to gather enough lighters or other items from which to cannibalize suitable O-rings.

A far more simple and quick fix, yet just as effective for excess bleeding, can be made from a piece of heat-shrink tubing. Because all naked light and heat should be kept away from the gas bottle, as the gas is highly flammable (propane), we'll use a helper tool to create the seal. The gas nozzle is 2.8 mm, so a 3 mm screwdriver shaft will do.

 

JUST ONE FIX

The general idea is to get a tight-fitting tubing around the gas nozzle. Instead of having the seal in the magazine, it's on the nozzle. The first thing to do is find a suitable metal or plastic tube, to act as a form on which to shrink the tubing. A drop of silicone on the form will make removing the tubing easier after it has shrunk.

After cutting a suitable length of heat-shrink tubing, place it over the lubricated form and apply heat to the tubing. Rotate the tube to get an even deformation on all sides. The tip of the tubing should be left just a bit over the form to allow it shrink just a bit smaller.

Then you simply pull the tubing off the form, and fit it on the gas nozzle. The thick end should meet the step on the gas nozzle to prevent the tubing from sliding too far. The thin end can be cut at a slight angle: This way it will reduce bleeding, but allow excess gas to escape from the magazine and liquid to enter. Trial and error will get you the results you like. You can then use a drop of superglue to secure the seal on the nozzle, but do make sure it has dried before you attempt to fill another magazine!

As usual, you are solely responsible for any damage from applying these instructions incorrectly, causing damage to your property or injury to yourself or other people. Happy Blue-Petering!