Completion of the Tokyo Marui GLOCK19 GEN3 Custom Project

This article covered the disassembly and customization of the Glock 19's blowback engine.

This time, I'll show you how to disassemble and customize the remaining parts.

Continuing with disassembly and customization.

Let's disassemble the barrel assembly. This has a significantly different structure from previous Tokyo Marui Glock series models.

Remove the screw in the red circle in the next photo. This will allow you to remove the outer barrel forward.

This allows you to remove the inner barrel and hop-up chamber.

Next, we'll disassemble the hop chamber.

Align the notch on the hop dial with the screw as shown in the next picture, then remove the screw in the red circle. In the picture, the outer barrel is still attached, but please assume it is detached. By the way, you do not need to remove the screw in the yellow circle.

Then the following parts will appear.

Once you've disassembled it this far, you'll be able to replace the inner barrel and hop-up packing.

In my case, to increase the muzzle velocity, I replaced the inner barrel diameter from the stock 6.08mm to a 6.04mm Crazy Jet barrel from Maple Leaf.

I'll explain this in the section on live-fire performance testing, but I was using the company's Super Hop hop-up packing with a hardness of 50, but the hop-up was too strong even with 0.25g BBs, so I switched back to the original part.

I'd like to convert to a long-range hop-up system if possible, but the stock hop-up arm isn't designed for that, so I'm currently researching how to modify it to that configuration. By the way, I don't really understand the theory behind using the sleeve on the Crazy Jet barrel to release air, and I don't really believe in it, but I often use it because it's of good quality.

In my case, I use an 84mm length insert for my Glock 19.

• MAPLE LEAF Crazy Jet Barrel 84mm
This is a barrel I often use in gas blowback guns. I'm not sure about the jet effect, but it's a well-made barrel overall.

The recoil spring remains around the slide, but since I haven't disassembled it this time, I'll omit its description.

Well, since most aftermarket products involve replacing the entire recoil spring assembly, you probably won't have many opportunities to disassemble it.

Next, as the final step in customizing the slide, I'll install the luminous sights from Tokyo Marui's Glock 17 GEN3.

This won't work without modification, so you'll need to do some editing like in the next picture.

Then, simply reassemble it in the same order you disassembled it, and it will be back to normal.

Next, there are two points to note regarding the installation of the flow valve. When installing the flow valve into the feeding nozzle, be careful about the orientation (up and down).

The photo shows a custom-made rocket valve, but the genuine part has almost the same shape and is top and bottom.

One more point, as I explained last time, is to remember to place the spring on the blowback engine (it simply rests on the blowback engine). Since the spring tends to shift when you fit the blowback engine, making assembly difficult, you can easily assemble it by fixing it in place with a very small amount of adhesive.

That concludes the explanation of the slides, so now I will explain how to disassemble the chassis.

This time, I haven't done much customization to the chassis, so this will be a brief explanation. I'll introduce any further customizations, such as the trigger, in the future.

First, remove the front chassis. As shown in the picture, first remove the spring connected to the trigger, then slide the slide takedown plate down and slide it sideways to remove it, and then remove the screws.

Next, remove two pins from the main unit, and the front side can be disassembled.

Once you've removed this much, the front chassis can be pulled out upwards.

If you want to customize the trigger, serial plate, or slide release lever, you'll need to disassemble it this far. By the way, I had a spare Garter extension slide release lever lying around, so I installed that.

Guarder Extended Steel Slide Stop for Tokyo Marui GLOCK Series
It improves not only the appearance but also the usability.

Next is the internal hammer assembly, which is the last part remaining.

Removing the internal hammer isn't too difficult; simply remove the screw located in the position shown in the picture.

After that, you can remove the internal hammer assembly by removing the pin attached to the grip.

Once you've disassembled it this far, you can remove the internal hammer assembly.

The internal hammer assembly can also be disassembled, but I didn't do it this time, and I don't recommend disassembling it because the spring is strong and parts tend to fly out.

If you're using the HF134a gas that's widely used in Japan, the strength and durability of the internal hammer spring and hammer itself are sufficient, so you probably won't need to replace them very often.

I don't really recommend it, but if you do convert to CO2, you'll probably need to replace this internal hammer part as well. Converting to CO2 will likely break the gun and make it difficult to adjust the muzzle velocity, so I don't really recommend it (though it's not impossible).

After that, you can put it back together using the same procedure as when you disassembled it. By the way, with products from other manufacturers, you would need to polish or adjust the slide rails, but as expected from Tokyo Marui, there is almost no looseness or sticking so I assembled it as is.

I've written an article about the mechanics of gas blowback guns, specifically the hammer, trigger, and magazine. Please check it out if you're interested.

The grease and silicone spray I use during assembly are Bellhammer No. 2 and KSC's silicone oil spray.

Bellhammer No. 2 Gold Grease
This is a classic, top-quality grease. No. 2 has the same ingredients as No. 0 but with a higher viscosity. I primarily use it for metal-to-metal connections.

KSC Genuine New Gun Oil 430ml
Any silicone spray will do, but KSC's is convenient because it comes in a large size.

Testing the live-fire performance of custom-made products

Now let's look at the actual firing performance.

The condition was to fill the magazine with HFC134a until a small amount leaked out of the fill port.

The ammunition used was S&T's 0.2g bio BBs, and the magazine's surface temperature was measured at 27°C using an infrared thermometer.

The initial velocities of approximately 12 shots fired in succession were as follows:

The readings increased by approximately 5 m/s compared to when it was straight out of the box.

I was aiming for over 70 m/s, but I fell just short. It's about the same as the company's recent full-size handguns, so I'll accept it.

The initial velocity stability was already good, but it has improved even further.

If you're interested, please also check out my review of the chronograph.

Next, we will perform a simple fuel efficiency test.

Magazine weight with different gas volumes.

This added approximately 11 grams of gas.

This is the weight of this magazine after firing 22 rounds at a surface temperature of 27°C.

I only consumed 2.5g.

Simply put, consuming 2.5g of BBs while holding about 11g means you could fire more than 4 magazines (88 rounds), but in my experience, with this setup, 3 magazines (66 rounds) is the most reliable number of shots you can reliably fire.

Next, I'll show you a dry-fire demonstration, and I've included a video demonstrating the blowback action.

東京マルイ グロック19 Custom

I think the movements have become much sharper and more agile.

Finally, regarding the ballistics, I checked it at Turf, located in southern Tochigi Prefecture.

This is just an image, but it looks something like this.

Turf's introduction page → Airsoft field introduction Part 1 Turf Battle Field regular meeting Southern Tochigi Prefecture

Initially, I was using a hop-up packing from Maple Leaf, but the packing was so thick and hard that it bent the hop-up arm, causing the trajectory to curve. Also, even with the hop-up amount at 0, 0.25g BBs would rise too sharply, making it unusable.

In the end, I switched back to the original packing and got the trajectory shown above. If you want to use Maple Leaf's hop-up packing, I think you should also change the chamber and hop-up arm.

This concludes the live-fire performance testing.

G&G Bio-Bullets 0.2g
It's inexpensive and accurate, so I use it for a wide range of purposes, from performance testing to airsoft games. It's been my favorite since it first came to Japan (around 2008). It lasts a long time for a biodegradable product.

G&G Bio-Bullets 0.25g
It's 0.25g. I generally use 0.25g BBs when playing airsoft.

Summary and extras

This concludes my review, disassembly, and customization guide for the Tokyo Marui Glock 19 GEN3.

I generally don't modify Tokyo Marui's gas blowback guns, but some of their compact models have a slightly disappointing muzzle velocity, so I customized this one to address that.

The initial velocity is stable at approximately 70 m/s with a 0.2g BB, so I'll consider that acceptable.

Replacing the flow valve spring with a slightly stronger one would increase the muzzle velocity somewhat, but 70 m/s with 0.2g BBs is more than sufficient.

The parts that were changed were:

will be important.

As a side note, when I tried to attach my S&T handgun light, it looked like it might fit if I forced it, but it was quite difficult.

This light attaches without any problems to the Picatinny rails on rifles and M1911-type picatinny rails, but it couldn't be attached to the Glock's rails because they are thicker.

I'll obediently buy the new handgun light released by Tokyo Marui (even though I hardly ever use it).

Now that the Glock 19 GEN4 has been announced, this might not be as valuable anymore, but the mechanism is almost identical except for the recoil spring, and the disassembly method is likely the same, so please use this as a reference if you are planning to buy a GEN4.

This concludes my review, disassembly, and customization of the Tokyo Marui Glock 19 GEN3.

Tokyo Marui Glock 19 GEN3 Gas Blowback
GEN3 also has its own unique appeal, so I recommend it.

Tokyo Marui Glock 19 Series Spare Magazine
This is a magazine for the Glock 19. Magazines from Tokyo Marui's Glock series should generally be compatible.