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It's a Classic Army MP5K
I've rebuilt plenty of version 2's before and yes i do have a Sorbo pad and bearing spring guide on the way for this new one. I'll fix up the AOE no worries.. done it before.
With this particular gearbox it just seemed to me like the m100 spring i was putting in was way too long... i really had to cram it in there. I test fired a few shots and got some serious grinding noises... so much so that i think the GB locked up on me after only a few semi auto shots. (i stopped firing because i was afraid of destroying it)
I also replaced the bushings but did not alter the stock shimming job.. it's possible that I've got a shimming issue now as a result. I'll open it back up and check everything tonight
As long as there are no specific springs for different gearboxes then that removes the spring from the equation of why it locked up on me.
thanks for the help guys
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