Specna gearbox woes.

[snuff]

Playing today with my specna arms SA-V carbine it decided to lock up the gearbox.It made a funny noise as in naffed gearbox then locked the piston.

I've had a cursory look but nothing detailed yet..why would it do this?7.4v Lipo unmolested standard gun.Thanks for any advice.

 

[EDcase]

Sorry to hear Snuff ?

Only way to know is crack it open...

 

[L3wisD]

How old is it @snuff?

 

[snuff]

2 years old I guess but not used by the previous owner.I was advised it is the "cheap" gearbox by a fellow owner.I will split it but wondered if it was common....never happened with my ICS guns....Cheers.

This--->https://www.patrolbase.co.uk/specna-arms-sa-v-carbine?pv=8204

 

[snuff]

That'll do it....any advice on 350 fps spring for this,thanks.

View attachment 52686

 

[Iceni]

@ak2m4

He's the man to ask. He should know exactly the spring for the job.

For a safe bet something like the ZCI M100 usually comes in slightly under the limit, but it'll depend on the barrel and airseal as well.

https://www.ak2m4.co.uk/internal-parts/springs/zci-aeg-spring-m100

 

[Adolf Hamster]

Ooh nasty, does it have a thrust bearing on the spring guide? If not might wanna invest in one.

I tend to avoid having one on the piston these days, rather keep it as light as can be without swiss cheesing the strength out of it.

 

[snuff]

Ooh nasty, does it have a thrust bearing on the spring guide? If not might wanna invest in one.

I tend to avoid having one on the piston these days, rather keep it as light as can be without swiss cheesing the strength out of it.

Click to shrink...

No thrust bearing,I'll order one when I get a spring.

 

[ak2m4]

Those first gen Specna's are just rebranded E&C, the QD spring guide "should" have a bearing on it, same as the one below...

It's very rare to get spring damage like that but it does happen.  "cheap" gearbox or not, happens to expensive AEG's as well