Systema High speed gearbox and motor semi auto issues

[HavocRenegade]

I was wondering if anyone could help me with a problem i am having regarding my brand new systema turbo mechbox. I ordered the turbo mechbox with the 1J spring with the systema turbo motor. I installed it properly into a G&P mechbox and wired it correctly. The gun shoots like crazy on full auto but when i switch to semi the trigger is frozen or it will only fire one and then freeze. Also, i am running a 9.6V battery. linked below is the systema mechbox kit

http://redwolfairsoft.com/redwolf/ai...l?prodID=21318

Thanks

[mcguyver]

Is the switch stop block broken?

Not an uncommon problem with some mechboxes, Systema among them.

[HavocRenegade]

it is a brand new mechbox so i don't think so but i found another one of our posts on here. (See link below) It is in a post 2005 G&P metal gearbox. How does that effect that part tho? If it comes down to it ill just live with the mechbox only shooting on full auto. Thanks

https://www.airsoftcanada.com/showthread.php?t=60964

[mcguyver]

Systema has had this happen to their gearboxes as well. The cast stop block is a little too small and gets torn off by the force of the trigger return spring.

[ujiro]

It happened to mine and mine was almost brand new.

[Styrak]

If the trigger post broke off, it wouldn't be firing at all.

[mcguyver]

Originally Posted by Styrak

If the trigger post broke off, it wouldn't be firing at all.

Not always. I fixed a G&P a few years ago where the semi was iffy, the switch block was hard moving back in semi. Full auto was fine though.

[HavocRenegade]

Can someone link me the thread that shows or tells how to fix it?

[mcguyver]

http://www.airsoftcanada.com/showthr...tch+stop+block

[HavocRenegade]

Alright bad news guys and girls. I opened up the mechbox to find that the post is still intact. There is no visible damage to any components. Any ideas what is causing this?