After doing some more research, I realized I did not adjust my AOE during the build and I think that contributed to the piston cracking like it did. Since Sorbo pads are all the rage I figured I would hop on the bandwagon and order one . I have a silent piston/cylinder head setup so I ordered the ASC V2/V3 SILENT Sorbo Pad – 70 Hardness from Airsoft Store Canada.
While I was at it I picked up a Lonex Extreme Toughness Piston to replace my broken Element piston.
Last night I took my gearbox apart to compare the Element CNC air nozzle and the stock plastic nozzle. There was maybe 0.5mm different in length between the CNC and plastic nozzle, to me it doesn’t look like its a big enough difference to cause the issue I have been having but I may revisit that idea.
Next I began digging deeper into the gearbox to test the compression between my cylinder/cylinder head/piston head and nozzle. I noticed the issue right away… my new Element Light Weight piston is barely holding together and is basically shattered under the piston head, if I flex the piston it seems to increase the space between some of the cracks. Looking at this it is obvious that I was not getting good compression having cracks all over the place on my piston, I guess a $5 piston isn’t the best pick for this spring and gear combination LOL.
For a temp fix I threw in the stock poly piston that came in the gearbox, I think I will pick up a higher end poly re-enforced piston from Lonex or Prometheus. After testing that the compression was good again, I reassembled the gearbox and did a short test with it hooked up to the battery. If I have time tonight I will resemble the gun, do some testing firing and then take it apart again to look at the condition of the piston.
So on Black Friday I was perusing the Canadian airsoft retailers for some good deals when I came across this KWA M9 PTP being sold for $143 (43% Off) by RevolutionAirsoft.com as part of their Daily Deals. Since I have been in the market for a new pistol I jumped at the chance to get a KWA PTP for such a low price.
Yesterday the pistol arrived via Canada Post (definitely wasn’t expecting it to arrive on Sunday but I’m not complaining )
The KWA M9 PTP came in a generic KWA Pistol box, on the side there is a sticker that says it is the M9 PTP model.
The first thing I notice was this sticker on the top of the box that says “For Canadian Use Only” and has a rating of 376 FPS. I think this must be for importation into Canada?
Opening the box reveals the typical items KWA includes like a few BBs, a small container of oil, the hopup adjustment tool and of course the pistol.
When picking up the gun for the first time I really liked the realistic weight to the pistol. The functional single and double action is very nice as well. I loaded the magazine up with 24 BB’s and charged it with some green gas so I could test fire it. The blow back is fantastic on this pistol, everything feels crisp and tight. You can’t see it in my photo but on the left side of the slide it is laser inscribed “KWA M9 PTP Cal. 6.00mm” and on the right side of the slide it says “Professional Training Pistol”
My only issue is the orange painted tip on the outer barrel but I knew it had that when I bought it. I haven’t quite figured out the best method of removing the paint, some people suggest a solvent while others suggest sand paper then polishing.
Aside from removing the orange paint the next thing I am going to do is chrono the pistol, I am interested in seeing how close to the 376 fps sticker on the box it actually is. Once I have my base fps for this pistol it will then be upgrade time! (Parts are already on their way!)
So my first attempt at building a gearbox hasn’t been smooth. Since putting it back together I have been having problems with BB’s miss feeding/jamming/and dropping out the barrel. If I turn the hop up on just a little bit the BB’s begin to jam and if I turn the hop up off a few BBs fall out the end of the barrel since there is nothing holding them in. I have made sure that the bucking and nub are seated correctly and the hopup unit is aligned correctly with the gearbox and magazine.
After doing some reading online I have a couple things I things I think I should look at. The first one is I installed a CNC air nozzle, I read that these can sometime be too long which can cause miss feeding/jamming etc.
The other thing I will look at is that I need to make sure I have good compression between the cylinder/cylinder head/piston head and nozzle (when the gun does fire correctly it chrono’s at 390fps so I’m not sure if it is a compression issue). I see online that some people suggest a few wraps of teflon tape around the cylinder head for a better seal but I’m not sure if I really need this step.
Right now I’m leaning towards that it is an issue with my nozzles length, tonight I will take some measurements of the stock nozzle and the Element CNC nozzle. I think I might even try installing the stock plastic nozzle instead of the Element CNC nozzle to see of that makes a difference. If the nozzle isn’t the issue then its back into the gearbox to check that I have good compression and take it from there.
This weekend I decided to take on an ambitious project, to relocate my mosfet into the buffer tube of my Beta Project Tactical AK and upgrade the gearbox. I don’t have any experience working on gearboxes other than the spring change I did on my M4 earlier this summer so I was a little bit nervous but also very excited to give it a try.
Upgrade Parts List:
Element Reinforce CNC Aluminum Air Seal Nozzle
Element Lightweight Piston
Element Silent Piston Head
Element Silent Cylinder Head
Systema N-B Cylinder Type-1
AF AEG Steel Helical Gear Set 100:300
Modify Advanced Shim Set
Guarder Infinite Torque-Up Short Type Motor
Stock Gearbox /w Mosfet installed. Upgraded Guarder motor installed as well.
Disassembled the stock gearbox, a little bit of green grease to cleanup. Though its not as bad as some of the other gearboxes I’ve seen on the internet from this gun.
I decided to give a go at installing some high torque helical gears instead of the normal straight cut kind. I read online that helical gears can be difficult to shim and have them mesh properly. If they are not aligned properly they will making a very loud squealing sound. I found a guide on ASC for shimming helicals that has you start with shimming the bevel gear first so it meshes properly with the motor’s pinion gear and you just take it from there. The guide was very helpful as the gears seem to be aligned properly and there are no grinding noises when assembled.
Shimming completed. Gearbox lubing and reassembly.
Gearbox installed back into the AK body. The battery lead is long right now for testing and fitting purposes, I will be shortening it soon so make room under the top cover. I had to use a Dremel to make room for the wires on the left side of the body to get the wires to fit.
The good news is that after putting it all back together it shoots and there are no weird sounds so far I’m looking forward to testing it out at the field this weekend. Before the upgrade the fps was 415fps, I’m interested to see how much fps was lost with the silent headset. Depending on the results my next upgrades for this gun will be a tight bore barrel, probably a CNC hopup chamber and maybe a new spring.
Cant say enough good things about “Loops” if you are gun fighting in BC you must see his videos!
Check out his Youtube channel here.
Also, his stills here.
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Check out a few black and whites from Loops on my Twitter page.
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The Maple Leaf Daimond Hopup Rubber is a new AEG bucking from AST. The Maple Leaf Daimond Rubber is a little different that the usual buckings available, the first thing I noticed was the 3 ribs around the outside of the bucking. These 3 ribs are to create a better air seal with the Hopup Chamber. The next thing I noticed was that it was a couple mm shorter than the stock bucking I have on hand.
The patch on the bucking is con-caved and is a sort of long triangular shape which is designed to create more contact with the BB when it leaves the Hopup Chamber. In the third picture I turned the hopup rubber inside out to reveal the patch.
The Maple Leaf Daimond Hopup Rubber is designed to be used with the Maple Leaf AEG Hop Tensioner (OHM). I picked up my Maple Leaf Daimond Hopup Rubber from WGCShop.com, but I do believe some of the local BC retailers are now carrying it too.
I picked up one of TorontoAirsoft.com’s Mystery Boxes a few months back, I did pretty good as I got a Beta Project Tactical AK which there only was 1 of in the lot of 200+ guns. Its a great gun externally, rugged all metal construction, the gearbox appears to be made by CYMA. So the gun is great but there is nowhere for my Mapgpul sling to attach to it.
In comes the Beta Project Sling Mount for the Tactical AK, it attaches on buffer tube between the reciever and the castle nut. Not sure what type of metal it is but it feels really sturdy and has a nice matte grey/black finish. The way it is designed makes it great for right or left handed sling positions. This sling mount was difficult to find in stock but I was finally able to get one from UNcompany.com, I think it took about 14 days to arrive.
If you own a Beta Project Tactical AK this is a must have.
The Maple Leaf AEG Hop Tensioner (OHM) is available at WGCshop.com. It features a con-caved bottom surface that follows the contour of the inner barrel. This allows it to push the bucking in bit more on the sides of the barrel window which is great for buckings with a V or U shaped patch.
In the comparison photo below I am using the Maple Leaf OHM nub with an A Plus REAPS bucking which I got from airsoftparts.ca.
I haven’t had a chance to test out the Maple Leaf OHM nub on the field yet but I hope to see a small increase in distance and hopefully accuracy with this nub and bucking combination.