m4 help

[paulh]

evening all just replaced the spring and piston in my m4 v2 gearbox put it all back together and crono it around 310fps briliant i thought :D however after fireing around 150 bbs through it the piston has locked back and i have had to strip the gun to release it have i done something daft and fitted something wrong? the spring that has been replaced was cut down by the shop to reduce the fps it had over time started to eat the piston the new piston is a element lightweight piston and head and the spring is a element M95ST any thoughts and help would be thankfully recived thanks all

[Crude Skinny B]

Re: m4 help

what battery are you using and is it fully charged?
did you shim the gearbox correctly? or at all?

[paulh]

Re: m4 help

the gearbox has been shimed and rotates fine the battery is not fully charged but has only been used for a couple of mins

[badas]

Re: m4 help

charge the battery 100% - see how it performs if it doesn't turn over on the first go don't do it again.

i would rebuild the gearbox and check it all over, make sure there is no damage to any teeth inside it, on the motor and no piston damage anywhere inc the piston head.

rebuild, re try.

if that fails i would put it dow n to the new spring is too short possibly resulting in the piston not being pushed back into a propper position quick enough and being cought on the gears on its return :/

[paulh]

Re: m4 help

ok thanks for the intel i will try this later and see how it goes

[private parts]

Re: m4 help

could it be pre-engaging?

[richardy]

Re: m4 help

its usually shimming or power, its getting to the back on full compression and it simply hasnt got the ummph to do the last bit. Check shimming and power.

notice how im ignoring that youve said shimming is fine thats becuase its usually shimming which isnt fine.

[paulh]

Re: m4 help

i have shimed the gearbox gear by gear and everything is running sweet as a nut i will be trying again this afternoon with a fully charged battery hopeing that this is the problem

[jagillham]

Re: m4 help

.... and everything is running sweet as a nut

Apart from it not working....?!

[paulh]

Re: m4 help

Apart from it not working....?!

lol :D fair point
heres a update charged the battery up pluged it in and ..........................

everything seems to be ok the charge in the battries must have been low fired a ful hi cap throught it with no stopages thanks to you for all your help and input on this.