PKM Gearbox - A Terrible Tale

[@thekeeefer]

The first test shot pre-work sounds like every "upgraded" PKM lol

[@NegativeAirsoftTech]

I know exactly what you mean... I'm pinning your comment as it's so 'on point' that it's perfection.

[@NonnaPossum1312]

Thanks for the Proper Tech Video m8, was sipping my morning latte when your finger exploded, very immersive experience 10/10

[@Tinblitz]

Midway through a plate of Christmas brie /10

[@MercutioUK2006]

Ah, Sid James. Never goes out of style :) Second hand gear is a massive roll of the dice, but with that caveat - the work on that gearbox is noice.

[@deltaforce2780]

This reminds me that I've had my second hand PKM for 6 years now and I should probably have the gearbox serviced as I've never even taken it out the receiver, dread to think what it looks like inside after so many years of constant usage.

[@danielk9906]

That wiring is mint (flavored)

[@Ultra-Collector]

She’s magnificent! Sounds amazing!

[@AdamHoy81]

Awesome job mate, thanks for the vid and keep up the great work 👍

[@leobates8783]

Nicely done. Thanks for the video bud.

[@DonCarlione973]

Awesome job, that sounded lovely at the end 👍🏻🤙🏼

[@Highpowers23]

I had the same exact problem with an A&K 249. I tried changing the bearings out for bushings and the gearbox would lockup about halfway through a cycle if you spun the gears by hand. I forget how I fixed it but something tells me the QC on these isn't amazing.

[@mucke7907]

Man, you really saved that one. Good Job!

[@Live1509]

Hi ned. Recently I put my hands on two factory new PKM from GunFire and both of them have the bearing holes not aligned. The gears turns but it it was a pain in the ass to shim them, expecially the bevel gear. Where I live the PKM price is 750€ but I them on deal at 440€ each. 440 for that shit! 😡

[@panthro9831]

They don't call 'em support guns for nothing. They need a lot of support.

[@mind-numbinginevitability]

Most excellent!

[@rogerborg]

"[An airsofter] wouldn't fire a hundred round burst from an MP5K" Ah, I've spotted the one piece of deliberate disinformation in this video!

[@philtrysstrongman]

Such a clever sausage ❤

[@TheAde71]

I’ve got the a&k m60 and my spur gear was bent and touching every revolution. Nice easy gearbox to work on though

[@darkshock42mlg05]

The only real reason it does a MOSFET is low battery detection. It would be a gate nano hard. Then again you can also use a lipo alarm. I. Fact that's what I do with my bullgear drum in my lct rpk16. Same as fields that don't have full auto restrictions. Also if you have a high speed build maybe they have rof limits so you use it as a regulator. It has a perun hybrid in it but the drum just uses 600 mah 7.4's. and I have 2. Hopefully it can last for all 5000 rounds.

[@Live1509]

I was looking to get a PKM but prices now are no sense. Six months ago I could buy it for 550€ but now is 779€, for an A&K! Absolutely non sense, the MSRP is 550$ 😑

[@war113]

I had a m249 with that gearbox...bushing kept breaking for the same reason.

[@orkharrid7065]

Wait a fucking second!! A tech vid? .... nah.... must be pissed.

[@matthewhunt797]

just stumbled on your channel and you seem to have a very knowledgeable....just getting into Airsoft and am looking for a full to mid size platform (6,3 so nothing to small) Dont mind a bit of fiddling but not too much, either full metal or mix and decent internals or base for easy upgrades??? Budgets about £300..will sub for info 😂

[@m1a1abramstank49]

Would a maple leaf bucking and nub work well with Cyma M14s? Assuming I cut it down a little of course

[@JedociderShou]

Nice adjustable gearbox 🤣

[@Thelss_]

What AWG cables did you use for this build?

[@rebornspawn]

Look at you big bollocks with the alignment trick 👍🏻 bravo. Question for you soldier, my gearbox case has just blown its front end off so obviously need to replace. What v2 shell would you recommend around the £50 mark please?? The one that has just shit its pants is a lancer tactical (I know😅) so I assume most boxes would be an upgrade in strength?? Running 13:1 gears, 7.4 lipo, high torque motor, silent piston set up. Would much appreciate your expert guidance. Cheers in advance fella.

[@ianaumy]

I’m not him but get a cyma gearbox and radius the front, you can usually get a complete gearbox for less than that, and keep the cyma parts in storage for later

[@NegativeAirsoftTech]

G&G are cheap & good

[@samuelvaladez2918]

Also VFC but the downfall is the proprietary spring guide@@NegativeAirsoftTech

[@rebornspawn]

Appreciate your time sir. Thank you 👊🏻

[@rebornspawn]

Cheers everyone for the help

[@baldpig2k12]

If it's vehicle mounted, why not power it off the vehicle? 🤔

[@jediknight1294]

Because a 12v car battery isn't as happy with this sort of power draw as a 7.4 lipo. You'd get a great fire rate but a lot of issues IIRC.

[@NegativeAirsoftTech]

​​@@jediknight1294I'm sure there's going to be a maths jerk out there with a sodding equation that explains that... 😂

[@jediknight1294]

@@NegativeAirsoftTech I'm from the Johnny Maxwell school of thought, 'as long as it doesn't smell like burning plastic when I turn it on its a win.' The tldr is 12v car battery would be a faster fire rate but more heat.

[@baldpig2k12]

You can easily pull a few hundred amps from a car battery for a short burst, I suspect the failure point will be the regulator, I think it would struggle with a load varying that much and that quickly

[@jediknight1294]

@@baldpig2k12 if you are really dumb and have it running off the vehicles system rather than a independant leisure battery regulated output you can get real hilarity as your 12v battery is now at 14.2v.

[@battlefieldathlete7387]

Bum Marriott

[@sabartadrel]

I love flumps

[@NegativeAirsoftTech]

It's a great marshmallow but also, it looks like how small dogs fart sounds...

[@GoDjangoAirsoft]

SHS Gears all day long. Got mine 249 with a base 20K and 13:1 Tuning up to a M150 20 RPS with 2,4 Joule on .32. Yeah we in europe east like it little rough than you englisch tea party girls

[@DeeJaye8920]

You are a faawkinngg king mate 👑!! Pure magic 🪄 I believe you Sir practice some kind of black magic 😂 AMAAAZING work J

[@Tinblitz]

So, before you put in those locating screws how did you stop the gearbox from realigning itself when you put the regular screws in? Did you just put them in at an angle and they held in place?

[@NegativeAirsoftTech]

Magic, skill & a chorizo slice

[@Tinblitz]

@@NegativeAirsoftTech As a gunsmith I watch has said "You're not just paying for my time, you're paying for the years I've spent figuring out how to do this".

[@jackoneill120]

I have one here from a teammate. Wich starts firing when the box mag is connected with the plug. Any idea what in the electronic of the magazine can cause this?

[@jediknight1294]

Sounds like a short somewhere so it's always on when plugged in, check the wiring oh and the microswitch hasn't welded itself on

[@NegativeAirsoftTech]

It's normally the stupid mosfet thing frying

[@alvareichon]

old pkm

[@katemucklow1696]

Any one recommend getting a pkm

[@NegativeAirsoftTech]

Same pro/con ratio as a 249 etc

[@bumsausage5791]

C Marriott

[@carlsonvicta699]

[@henkjansma5529]

Ssp5 next pls 😁

[@NegativeAirsoftTech]

Already got a video on that. The bum sausage man is on it

[@stewie50001]

@@NegativeAirsoftTechYou messed with the 4.3 or 5.1 yet? I know you hated the way it looked, was wondering if you enjoyed the others more or if the look is still fugly to you

[@NegativeAirsoftTech]

@@stewie50001 fugly but works

[@stewie50001]

@@NegativeAirsoftTech I figured lol. Someone really should make a nice Beretta

[@henkjansma5529]

@@NegativeAirsoftTech ow shit I looked over that woeps

[@JpmonstaGaming]

This is a common issue with A&K MG gearboxes. Dogshit QC and manufacturing.

[@SupremacyDealer]

And that y hpa

[@MadalinCurea]

thanks for the advice for the future, and keep it up with this work🫡🫡🫡😎😎