2014-04-16 / 22:40 UTC GMT +00:00
im looking for a guide on how to mod the mk23 mags so the will take a full charge. if you got a link post it up.
Here it is minus the pictures
Converting TM Mk23 mags for green gas use
Since being introduced to the market, the Tokyo Marui Mk23 non-blowback gas gun has been looked at as a very capable, yet inexpensive skirmish weapon. While not as cosmetically pleasing as the KSC blowback version, it can perform just as well without the potential for damage that the KSC version is known to suffer when using green gas. In addition, the TM version exhibits better gas efficiency than the KSC version. However, one of the problems first experienced by owners of the TM version is that the mags will leak when green gas is used. It turns out that TM uses a simple little valve to prevent too much pressure inside the mag. A simple fix will allow green gas to be used, which of course increases the muzzle velocity.
Modification
To start, you'll need the following:
• Epoxy or some other strong adhesive, like JB-Weld
• Small bit of sandpaper
• Punch/small screwdriver (or a drill)
• Hammer
• Silicone oil (optional)
First, you'll need to knock the two pins free from the main shell of the mag. These two pins hold the floorplate up into the mag. Using a punch of appropriate size (or small screwdriver), tap the pins out lightly with your hammer. Please refer to the following picture.
You can see what looks to be a third pin in between the two outside pins. However, it is a boss that is indeed not removable, as it serves to be a locking feature to keep the floorplate/valve assembly in place. Therefore, it needs to be modified in order to pull the bottom off the mag. While you may choose to use a Dremel (carefully!) or some other method to work the boss down to where you can pull the floorplate off from the mag, I chose to take the brute force method and just pound on it with a punch and hammer. This deformed it enough to get the job done.
Once you have accomplished that, you can start to pull the mag apart.
Pull slowly, as you'll soon encounter the spring and pressure valve assembly. You'll see the spring first, held in place by the outer shell of the mag. The spring holds the pressure valve into a hole. That hole is the one we'll fill in order to stop the mag from releasing the green gas.
Once you have the spring removed, you'll also be able to remove the pressure valve. You'll then have what is seen in the following picture.
Next, you are going to take your small piece of sandpaper and sand the inside surface of that hole. Just enough to roughen up the surface a bit, so the adhesive will adhere well. Then, apply a very small amount of your adhesive to the pressure valve and stick it down in the hole, making sure the o-ring is facing down into the hole. Stick the spring back into the hole, making sure not to get too adhesive on it, and slide the floorplate back into the outer mag shell, just far enough to hold the spring tight against the pressure valve. Let this sit until the adhesive is fully cured (refer to the directions/information that came with whatever adhesive you are using). Once the adhesive has set, remove the floorplate assembly from the outer shell, remove the spring, and fill up the rest of the hole with your adhesive, leaving the spring out from the assembly since it is no longer needed.
Again, let it cure completely. If the hole isn't filled entirely, repeat filling it again.
Lastly, you'll want to apply a thin adhesive layer over the hole, making sure to create a seal over the top of the hole. Again, make sure to let the adhesive fully cure.
At this point, you can test the mag by reassembling the floorplate back to the outer shell, inserting the two pins, and then trying to the fill the mag with gas. There shouldn't be any leakage. If there is, you need to make sure you let the adhesive fully set and also that you sealed that hole well with the adhesive. If there isn't any gas leaking, take the pins back out, apply silicone oil to the large rubber gasket, and then reassemble the floorplate back to the mag.
Performance
Now, on to results.......doing this simple mod will of course increase the muzzle velocity, but what kind of performance can you expect? Well, on a 57degF, sunny day, I put ~3 mag's worth of shots through the gun on one gas charge. Each mag of course holds 28 shots. The first shot in the first mag registered on the chronograph at 350fps using 0.2g BB. Following shots from that first mag were all in the 340fps range. I then loaded the mag back up with BB's, let it sit for a minute or two, and then shot through it again. Shots were fired every 1-2 seconds and they consistently registered in the 330-340fps range. Lastly, I loaded up BB's in the mag again. Shots in the 3rd mag were weaker, registering in the low 300-320fps range, with the last few BB's hardly firing as the gas ran out.
