RPK Modding Questions!

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[Jafo]

Yuck, G&P pistol grip...  :?

[Unknown Soldier]

hhaha,  I got a brown guarder grip to put on it,  I just liked the big wood pistol grip.  I got big hands so it works good for me.

And Krazny, thanks again for the link on that kit bud,  working out pretty good so far.  You got any sources on a cheap front retainer now that will fit the rpk?

[Jafo]

I may, lemme look through the bookmarks.

*edit - wanna trade a brown Guarder grip for a black CA grip? Kinda trying to make my AKS74 complete.  

[Unknown Soldier]

I actually need another myself,  Element is releasing some that should be pretty cheap.  Gonna have to get me a couple.  

Thanks again for helpin out man,  Kinda crazy that the wood kit is 70 bucks but the retainer is 40 bucks.  At least thats the cheapest I can find it(K-Var)

[Unknown Soldier]

Got the CA retainer to work with the RPK lower.  Now all I need is the svd front end and inner barrel.

[Vanya]

Looks good so far.  So, I guess no one knows if I can mod a Guarder barrel to fit an ICS AK?

[Batou]

I was just wondering which avaliable AK varient on the market would make the best RPK donor gun? I'm planning on installing a nearly 100% aftermarket gearbox in it and was wondering where I should start? I would prefer to have a body without the lightening cuts in the side, but there's aftermarket receivers avaliable without them so that really isn't an issue. I would prefer to go the RPK-74N route as it would fit into the more modern look of my team. Any suggestions?

[Feda]

Do you want to change all GB internals or do you want to put a whole new GB into the AEG?

[Batou]

Do you want to change all GB internals or do you want to put a whole new GB into the AEG?

I was planning on changing out the internals in order to beef up the gearbox. The SLR I have has 7mm bushings, which is a feature I would like to have if possible as I would like to use this gun as a support weapon. However, supposedly the r.s. version of the RPK isn't designed to be shot more than 80 rounds in a burst or else there's the chance of cook off. In addition, I'm intending on reducing the rate of fire to something realistic in order to get the fps up.

[Feda]

Then I would suggest you chose a TM AK 47. Unless you didn´t buy your SLR for this purpose. How much fps do you want?

[Vanya]

I just had an inspiration for my RPK project.  Instead of using wood, and having to hollow out the stock, I'll just use Soviet plum furniture.  I don't want an RPK-74, though, because the magazines are 'spensive.  Would plum furniture be out of place on a plain old RPK?

[Batou]

Fedayin-

You gave me an epiphany. I could use my SLR as a donor gun, as it's receiver is a stamped type and if I truly wanted to make the RPK-74N version there are metal bodies and kits out there that are based on the stamped look and are far cheaper than buying another AEG. Unfortunately, I would have to take off my GP-30, but by the way that everything seems, the conversion between AK and RPK once the Metal receiver is in place would be rather easy as I have learned from disassembling my SLR on many occasions to the individual components. If I wanted to use the GP-30, I could always make a quick conversion of detaching the RPK stock and front barrel assembly and reattaching the AK stock and barrel assembly.

But regarding the gearbox, I intend on bringing it near the local limit of 420 FPS as the RPK is a support weapon and there are quite of lot of SAWs that I will encounter opposing me. The upgrades I was looking at all center around a longer barrel, to be precise a 650mm barrel cut down to fit the RPK. From what I could gather, the use of such a barrel requires a bore up kit, which in turns seems to require a M130 spring or higher. I’ve included below my plans for an aftermarket gearbox if you wish to see what I’m trying to do.

Gearbox Shell – King Arms Version 3 w/ 7mm bearings
Motor – Systema Short Type Magnum Motor
Cylinder/Piston Head/Nozzle – Guarder Bore-Up Cylinder Set for TM AK-47/47S
Spring Guide – Aftermarket Version 3 Spring Guide with Thrust Bearing.
Anti-Reversal Latch – Aftermarket Version 2/3 Reversal Stop Latch
Gears – Prometheus Triple Torque Gear Set or Equivalent
Spring – Prometheus Nonlinear M140 Spring or Equivalent
Wiring Harness - Classic Army AK Wiring Harness
Spring Kit - King Arms Spring Set

Additionally I intend on replacing the hop up bucking with a harder one to withstand the wear and tear of a higher fps bb. If anybody sees anything that should be changed, please let me know.

*edit*

I just had an inspiration for my RPK project.  Instead of using wood, and having to hollow out the stock, I'll just use Soviet plum furniture.  I don't want an RPK-74, though, because the magazines are 'spensive.  Would plum furniture be out of place on a plain old RPK?

 I don't think that the RPK came with the Plum furniture, but I could be mistaken. However, I do know that the early RPK-74 came with wood furniture. A for magazine prices, I don't know why a '74's magazine would be more expensive than a RPK's.

[Unknown Soldier]

I think it would be cheaper to start with the slr,  its got a great gear box and can most likely with stand your 420fps with stock internals.  Its got a great ROF stock too.  I would only suggest changing the piston head when upgrading your spring.  Mine shoots 345fps @ 22bb's a sec all stock with a 9.6 elite 3600 battery.

[Batou]

I think it would be cheaper to start with the slr,  its got a great gear box and can most likely with stand your 420fps with stock internals.  Its got a great ROF stock too.  I would only suggest changing the piston head when upgrading your spring.  Mine shoots 345fps @ 22bb's a sec all stock with a 9.6 elite 3600 battery.

Thanks for the tip, Unknown. My gearbox isn't stock unfortunately, I stripped a tooth on the part of my selector gear that dosen't engage the piston so I replaced it with a CA Torque-up set (Non-Helical Type). I guess I just like working on mechboxes. *laughs*

[Unknown Soldier]

So your looking for something cheap to start with and make your own mechbox to drop in it?

Not including the mechbox,  how much are you willing to spend on the externals? You can get a plastic gear box ak47,  buy the cheap stamped reciever and rpk kit from gunner and drop you custom gear box in for pretty cheap and probly wouldnt look too bad.

What kind of wood you want to use,  the cheap gunner kit,  inokatsu kit, or real steel kit?  If you get the cheap gunner kit or inokatsu kit, they both come with the barrel extension and bipod,  if you getthe RS kit youll need to source a longer barrel and bipod and probly cleaning rod.

If you use the slr or cyma 031 as a base youll need to source out an ak47 gas block and front site so it would probly be better to get an ak47 varient.  

You could use the cheap svd/ak hyrbid that out there now but then youll have to source out for a rear tang set for the stamped after market reciever.

They way im going seems to be pretty cheap, slr for the base,  cheap svd for the outter/inner barrel, bipod, gas block, and front site, and RS wood kit.

[Batou]

So your looking for something cheap to start with and make your own mechbox to drop in it?

Not including the mechbox,  how much are you willing to spend on the externals? You can get a plastic gear box ak47,  buy the cheap stamped reciever and rpk kit from gunner and drop you custom gear box in for pretty cheap and probly wouldnt look too bad.

What kind of wood you want to use,  the cheap gunner kit,  inokatsu kit, or real steel kit?  If you get the cheap gunner kit or inokatsu kit, they both come with the barrel extension and bipod,  if you getthe RS kit youll need to source a longer barrel and bipod and probly cleaning rod.

If you use the slr or cyma 031 as a base youll need to source out an ak47 gas block and front site so it would probly be better to get an ak47 varient.  

You could use the cheap svd/ak hyrbid that out there now but then youll have to source out for a rear tang set for the stamped after market reciever.

They way im going seems to be pretty cheap, slr for the base,  cheap svd for the outter/inner barrel, bipod, gas block, and front site, and RS wood kit.

Unknown Soldier-

I'm thinking about using my SLR as a donor (which gives me an excuse to buy another gun at Christmas time) and using either the Gunner or the Inokatsu kit, preferably the latter if I can find it. Which makes this RPK about 300 or so dollars cheaper than it would be if I was to use a donor. I'm going to try to find a stamped receiver with the side mount if possible as I have the plastic furniture SLR, not the wooden one. Additionally I would like to find a metal front set, which I know G&P makes, and use it in place of CA’s plastic version. I’m essentially replacing the gun below because it doesn’t fit into my team’s gear.

[Vanya]

'74 magazines are more expensive because they are all midcaps, and if I DID do an RPK-74, I'd have to mod RS mags for it to look accurate.  Which = more expensive than 10 STAR magazines and less efficient than a drum mag.  I think I'm just going to make a custom RPK, and generally make it personalized.  It'll take a while, but it'll look awesome when I finish it.

[Batou]

'74 magazines are more expensive because they are all midcaps, and if I DID do an RPK-74, I'd have to mod RS mags for it to look accurate.  Which = more expensive than 10 STAR magazines and less efficient than a drum mag.  I think I'm just going to make a custom RPK, and generally make it personalized.  It'll take a while, but it'll look awesome when I finish it.

Custom RPKs are the way to go, I just hope Gunner will answer my order. I'm going for the early RPK-74 look myself, no drum mags with the mags tapped together.  

[Feda]

Gearbox Shell – King Arms Version 3 w/ 7mm bearings
Motor – Systema Short Type Magnum Motor
Cylinder/Piston Head/Nozzle – Guarder Bore-Up Cylinder Set for TM AK-47/47S
Spring Guide – Aftermarket Version 3 Spring Guide with Thrust Bearing.
Anti-Reversal Latch – Aftermarket Version 2/3 Reversal Stop Latch
Gears – Prometheus Triple Torque Gear Set or Equivalent
Spring – Prometheus Nonlinear M140 Spring or Equivalent
Wiring Harness - Classic Army AK Wiring Harness
Spring Kit - King Arms Spring Set

My preference:

Stock shell
TM EG1000s
Prometheus Full Torque Up Kit (with normal torque gears) for GB V.3
Prometheus Cylinder Type 0
Prometheus HU Bucking
G² Metal Hop Up Unit
Prometheus MS120
And make your wiring yourself  

Should make 420-450fps, as far as I was told by very expirienced Airsofters. The problem is the barell sucking, because of the RPK barell length.... :?

If a bore up kit is necessary, take a Systema. With a Prometheus MS120, it should bring almost the same as the Prometheus Kit.

Or you could buy a G² AK Gearbox, a G² HU Unit, a Guarder RPK Conversion Kit, a barell (Prometheus, Systema, ....) and a motor and a motorspacer (the part that combines motor and gearbox, forgot the name for that...)

If you may not get over the 420fps-limit, take a HurricanE Tuning Kit, a Prometheus MS110, a nice PCB Piston and a new HU and a tighter barell, so you´ll get ~400fps.

[Vanya]

Hey, what else besides the following internals will an ICS need to be able to be used as a support weapon?
AEX Extreme High-Speed Upgrade (Systema HS flat gears, Systema metal bushings, M100)
Systema HS Short motor
Also, what length barrel does the RPK take?

[Batou]

Gearbox Shell – King Arms Version 3 w/ 7mm bearings
Motor – Systema Short Type Magnum Motor
Cylinder/Piston Head/Nozzle – Guarder Bore-Up Cylinder Set for TM AK-47/47S
Spring Guide – Aftermarket Version 3 Spring Guide with Thrust Bearing.
Anti-Reversal Latch – Aftermarket Version 2/3 Reversal Stop Latch
Gears – Prometheus Triple Torque Gear Set or Equivalent
Spring – Prometheus Nonlinear M140 Spring or Equivalent
Wiring Harness - Classic Army AK Wiring Harness
Spring Kit - King Arms Spring Set

My preference:

Stock shell
TM EG1000s
Prometheus Full Torque Up Kit (with normal torque gears) for GB V.3
Prometheus Cylinder Type 0
Prometheus HU Bucking
G² Metal Hop Up Unit
Prometheus MS120
And make your wiring yourself  

Should make 420-450fps, as far as I was told by very expirienced Airsofters. The problem is the barell sucking, because of the RPK barell length.... :?

If a bore up kit is necessary, take a Systema. With a Prometheus MS120, it should bring almost the same as the Prometheus Kit.

Or you could buy a G² AK Gearbox, a G² HU Unit, a Guarder RPK Conversion Kit, a barell (Prometheus, Systema, ....) and a motor and a motorspacer (the part that combines motor and gearbox, forgot the name for that...)

If you may not get over the 420fps-limit, take a HurricanE Tuning Kit, a Prometheus MS110, a nice PCB Piston and a new HU and a tighter barell, so you´ll get ~400fps.

Thanks for the advice, Fedayin, I sent in my order last night with some changes and I hope to hear back from them soon. *tries to think up another word for the motorspacer* I think they refer to it as a motor mount or cage, depending on where you look. As soon as I get everything, I’ll take some pictures and put together a little guide to my RPK project.

Hey, what else besides the following internals will an ICS need to be able to be used as a support weapon?
AEX Extreme High-Speed Upgrade (Systema HS flat gears, Systema metal bushings, M100)
Systema HS Short motor
Also, what length barrel does the RPK take?

With the AK-74 flash hider, you can use the 650mm barrel without any problems, and if you use the normal flash hider, you need cut it down to 634mm. If you don’t want to cut it down, you can use a 590mm barrel. Supposedly, with the First Factory Prometheus (Lay Lax?) barrels, you should use the Prometheus hop up bucking as it provides a better seal do to it’s increased length.

[Unknown Soldier]

Got my jg svd,  its almost done

[Batou]

Nicely done! Face any real problems when fitting the parts?

[Unknown Soldier]

yeah one little one,  the barrel on the svd is too fat,  it only thins out where the gas block goes too.  I had to bore out the gas block in order to get it to slide down the barrel to the right spot.  Besides that it was pretty easy.

[Batou]

That's good to know. I'm waiting for my parts to show up. I decided on buying the plum RPK 74 furniture from K-var and though it's for a stamped receiver rather than a milled one, I'm going to to try and make it work. Works things that happens is that I have to reinforce the neck of the buttstock and mill slots for the tangs into it. I also picked up a real steel plum 40 waffle magazine to modify. I'll let you know how easy or difficult it its to use the stock, as it's something different than the normal wooden stock that is commonly used.