Ak 74 downgrade

dwelby101

Hi,

my Ak is coming in too hot and i need to downgrade it, i know that an m90 spring will bring it to 290 - 300fps and an m100 will bring it to 320 - 340fps so i just wanted to know if anyone has any experience with downgrading their AEG's and had any good advice on what to do or go for?
Cheers!

Leftyflip

dwelby101 wrote: »

Hi,

my Ak is coming in too hot and i need to downgrade it, i know that an m90 spring will bring it to 290 - 300fps and an m100 will bring it to 320 - 340fps so i just wanted to know if anyone has any experience with downgrading their AEG's and had any good advice on what to do or go for?
Cheers!

Stick in a Vanaras M90, you'll be looking at about 310-315fps. Also be prepared to cut the spring, no matter what brand you get. You may need to cut off a few coils, depending on fps.

dwelby101

Hey leftyflip,

i kinda wanted to downgrade it without having to cut the spring, i read that the systema 1j option might be the one to go for, it says it brings it in at 320fps +- a couple, do ya still think i would have to cut it tho?

Leftyflip

dwelby101 wrote: »

Hey leftyflip,

i kinda wanted to downgrade it without having to cut the spring, i read that the systema 1j option might be the one to go for, it says it brings it in at 320fps +- a couple, do ya still think i would have to cut it tho?

It varies in every AEG, depending on seals, barrel lenghts etc, cutting the spring does no damage, just file the end.

Stercus Accidit

AK74's tend to get high fps out of a spring, long barrel, non vented cylinder.

Get an ms90 and even then, as said above, you may need to snip the spring.

dwelby101

Im a bit hesitant about gettin a spring thats too low because i dont want to lower the fps too much lower than 328. So im thinkin the best option might be to get this systema 1j one and possibly cut it if needs be. How exactly do you know how much of the spring to cut or is it just trial and error?

thermo

The rule of thumb is each coil cut drops the fps by 10-15

DeBurca

If you are willing to cut the new spring that you get then why not cut your existing spring you have nothing to lose as you are willing to replace it anyway
If you have a means of measuring the spring coil diameter and length accurately ( may I suggest a Vernier) and post it here then I and many others on this forum could advise you as just how much to snip from your existing spring to get you in the 315-320 fps range

Gatling

dwelby101 wrote: »

Im a bit hesitant about gettin a spring thats too low because i dont want to lower the fps too much lower than 328. So im thinkin the best option might be to get this systema 1j one and possibly cut it if needs be. How exactly do you know how much of the spring to cut or is it just trial and error?

one thing to remember 328fps isnt a target its the maximum allowed by law there is little or no difference between 300-315 and 328fps

dwelby101

Cool, i think ill try it on my current spring so and see what happens, one last question, i presume that i cut the spring at the end furthest from the piston head, would that be correct?

DeBurca

Ya that the best end to cut from

Shiva

Gatling wrote: »

one thing to remember 328fps isnt a target its the maximum allowed by law there is little or no difference between 300-315 and 328fps

Thats a very good point, and one worth repeating a lot.

A lot of people aim for 325, 326 and 327, and that's all well and good...but then if you want to play on a particularly warm day, or at a site thats at a higher altitude, you could very easily end up with a gun thats shooting over the limit, and not be allowed use it.

Anything from 290 to 320 with a decent hop up will be more than adequate.

dwelby101

Hice one fellas, cheers!
Ill update with some pics and stuff when i get it sorted, thanks again.

lochdara

also chat qas. They sorted mine without a new spring or drilling. Firing at 315 at rapidfire on sunday

dwelby101

Ya the guys there said they'll do it no bother, im just a bit curious to see if i can do it myself and see how the mechbox works, i need to change the bushings and the selector plate anyway so i think ill give it a go, it could be a good idea... or a really bad one:D

lochdara

cool. Same here so i got a cheap gearbox to try on first.