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KWA TK.45c

#1 User is offline   aotsukisho 

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Posted 27 March 2019 - 03:30 PM

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I never intended the purchase this one, but the looks were just too good. I am a sucker for long barrel rifles but there is something about the unorthodox setup of having a SBR that is essentially a big SMG. Pistol round mags are a lot more ergnomic to me, and after seeing and handling both the KWA TK.45c and the G&G ARP9 at ePowerSports in Oahu it became clear to me that I will be purchasing one of them. I really liked the ergonomics of the ARP9, especially the magazine feedback (the click as it seats, and the break when the release is pushed), not to mention the color schemes available from the factory was sharp looking and I think something pretty special in terms of customization. However, there is nothing I love more in futuristic guns that the original Titanfall, and that slanted magwell (even if it's in .45cal and not a monster 8.19mm caliber) was what sold it. I had originally gone into airsoft thinking that I'd go only with guns I was a fan of historically but great job to KWA with taking a chance with the overused M4 platform and doing something special with it.

This was also my first high-end airsoft purchase, my first being a $20 spring pistol and second being the secondhand first gen G&G Raider. The feature set of the TK.45c is something I was honestly blown away by. The dust cover release through the charging handle is cool and easy to do when you need to adjust the hopup. The ambidextrous bolt catch was a feature I never realized I needed, as there is no spring tension that automatically locks the bolt catch in place and you are able to hold it up with your trigger finger while racking the charging handle with your other hand. The flip up backup sights and collapsible stock were tight and difficult to open and close when the gun was brand new, but with usage they have loosened enough to be opened and closed comfortably but not wearing to the point of unusability. The K120 midcap stick mags are the only one available right now (no hicap like the G&G ARP9...which is a very nice hicap btw, fat winding wheel) so that's what I have.

This thread will chronicle my projects featuring this gun, I do love how it looks but it is very heavy so my first project was turning it into a rifle rather than SMG.
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#2 User is offline   aotsukisho 

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Posted 03 April 2019 - 03:53 PM

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Flash hider/suppressor(?) has a single 1.5mm grub screw on the bottom, loosen this and it will reveal the -14mm CCW threads. Need to go through the hole on the picatinny section of the RIS to get to it.

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This standard size barrel suppressor fits barely, the RIS is very slim

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Three screws on the bottom next to the magwell

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1.5mm grub screws underneath the fake gas block

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Removing the fake gas system to expose the bare outer barrel

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#3 User is offline   aotsukisho 

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Posted 21 June 2019 - 11:17 AM

Some updates for the TK.45 project, it is more or less complete minus some

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Pulling off the rail to work on it again

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Removing stock with the rear wiring in order to get to the gearbox

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Motor grip plate removed. I'm not sure if they could have designed it where the magwell screw was treated as a hinge pin but it's a little inconvenient to have to remove four screws insteaad of just two.

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Stock motor with its suppression unit attached. I'm guessing it's a kickback diode or something similar. Works well in a stock setting, I might relocate it to my G&G Raider-L as that gun is still stock.

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Motor grip removed

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Gearbox is out

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Removing the false bolt and charging handle mechanism. This is one of the few airsoft guns I've seen with a v2 gearbox where the charging handle is actually integrated onto the gearbox shell and not the upper receiver.

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Cracking open the gearbox shells and you can see into KWA's modified v2

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Closeup of the front of the trigger area.

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I will use the stock piston for now, it is surprisingly simple looking. Flat surfaced aluminum head makes for very easy damping attachment, and not having any of those O-ring expansion holes on the face makes for reliable compression testing at any speed.

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Trying these out from Clandestine

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Out of focus pic with the sorbo pads glued to the stock piston head. Cleaned with alcohol and scuffed with a knife first for maximum adhesion

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Sorbo pad serves two purposes. First, it acts as shock protection when the piston head slams into the cylinder head, which reduces wear and tear especially on stock gearbox shells which may not be made of the most durable material. It also corrects the angle of engagement of the pickup tooth on the piston, which ideally will take place vertically from the sector gear's shaft axis. This minimizes frictional and up/down forces on the piston's rack of teeth and horizontal guides, and allow it to engage with the sector gear in a more efficient way. It's a little hard to see since the tappet plate is in the way, but the trailing edge of the pickup tooth is directly over the sector gear bearing.

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Putting in a longer barrel I had laying around. The TK.45c is going from PDW length to SBR

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The cuts on this barrel are a little different

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Cleaning out the bottom shell

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Gate Titan going in

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Running the wires along the tracks in the gearbox

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Gearbox is back together, and tested working. I needed to use one of the stickers on the KWA selector plate, as the stock plate does not have electrical contacts that the light sensor can read properly. Nylon is too reflective

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The final upgrade for this gun is a Rocket Airsoft motor, neodymium magnets and a 16 turn armature. The SHS high torque motor was overkill as this gun, due to its unique gearbox design, will only be running an M120 spring to keep it alive as long as possible. I can put in a speedier motor as the spring is not strong enough to slow it down, and this especially shines in the Titan's 3 round burst functionality.

I might make a video showing it off, but I will put it through another game day first to make sure all the kinks are worked out.
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#4 User is offline   aotsukisho 

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Posted 07 January 2020 - 12:53 AM

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A few months ago I was using the TK.45 during a match but it slowly lost FPS and then completely stopped working. Wasn't able to teardown until now

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I thought I lost compression but it was the piston rack instead. Only one metal release tooth and I was running it with both an upgraded motor and spring

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New build is in order. Needed to dremel out the front of the gearbox to make it front-wired

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Got a new, more racey rail system for it too but it needed to be modified to fit the TK.45's front end

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Barrel nut system where the rail screws into it. Needed to use 3x blue and 1x red Dytac barrel nut shims

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Installing the TK.45 fake gas system

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Rail is in place, loctite the screws tho

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Also modified the tappet plate since I was having feeding issues with the project...cut down to 10mm and sanded off the scallops on the fin.

Updates to follow soon
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#5 User is offline   aotsukisho 

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Posted 04 February 2020 - 01:18 AM

Had some issues with the anti-reversal latch mating up with this set of gears, or possibly the way it was shimmed. It would fire just fine in semiauto with cycle detection turned on, but firing in full auto led to some strange behavior where it would struggle to start shooting again.

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The piston was jammed all the way back into the buffer tube area, was able to tap it forward so I could remove the gearbox

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Cracked open the gearbox and this is what I saw

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Not sure why Siegetek decided to go with this half-post design for the tappet timing, but it was easily able to rip back into the rear of the tappet plate when the windback arrest didn't happen.

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Since the TK.45 has a proprietary nylon tappet plate, I could not swap it out for a POM one to better withstand the lower surface area. I decided to change gears (literally) for a 20:1 8t Siegetek set instead, this time with full timing posts. Different generation?

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Got it working, but with a ridiculously low FPS. It's good to see a consistent FPS but it's 100 lower than what I expected from an M170

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Reading around and finding that the low fps might be caused by the softness of the Air-Pad I had installed onto the cylinder head, I reworked another Retro Arms cylinder head with a neoprene pad cut into four pieces to provide a clean path for the air to escape and not be caught behind the shock absorber.

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Sloppily glued in place, since this was proof of concept

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Made sure to let it dry, then teflon tape under the Retro Arms cylinder head O-ring. Always found it strange how loosely Retro Arms' own cylinder head seals in their cylinders.

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Misfocused photo but you get the idea

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Reinstalling everything into the gearbox

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...and FPS is even lower than before. What the heck?

Now back in my Nerf days, I remember people complaining about 'reverse piston' designs where the cylinder itself moves rather than the plunger inside. This design has a lot of dead air inside the cylinder once compression has taken place, and a lot of the work done by the spring is wasted by this air volume not being used.

I think this applies to this situation, the damper is allowing a bunch of air to sit inside the cylinder not being pushed out. I will need to apply a spacer behind the piston head, rather than provide damping in front. The piston head needs to end up as close to the cylinder head as possible, this is the only way I will achieve a reasonable FPS without using a spring that destroys this proprietary gearbox.
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