Thought i would share some info on the cannon for the Panzer(please note==there are differences between the gun on this panzer and a typical HL cannon gun mechinism.) the breech on this Panzer gun is different than one for a HL tank.I haven't worked on any for the HL tanks so the following only applies to the Panzer cannon,the other's are slightly different.The rubber gasket took me a little while to figure out.It goes inside the breech from the end the BB's feed into.It serves as a seal and also would keep the BB's from just falling out the barrel if the barrel was tiped toward the ground.When the internal plunger propels forward it pushes the BB through this seal and at the same time this plunger goes into the seal a ways when it shoots.without this seal the gun will not shoot a BB.When it is in place you can still see just a little of it protruding where the BB's go into the breech.Now my gun shoots perfect and with a good deal of power.As stated above in this post I had striped a gear when testing it after taking it apart after finding the seal jammed in the breech.
When I opened it up the first time parts went flying,when putting it back togeather I discovered wraping string around the spring chamber would hold everything in place while putting the two halves togeather and getting all the gear post lined up.Then after everything starts going togeather the string can be cut and pulled out before tightning all the screws.Took me a bit to figure out the string method is the easy way to do this.I did use a gear from a HL gun mechinism and some of the gears can be inchanged,but some may not work.Also the original motor has the gear on the shaft in a different length from the motor than on the one from the HL gun.
So these will not just interchange with out some addjustment having to be done to the gear or the depth of the motor to be installed.
Hope this may be helpfull to anyone else who may have to work on one of these. BIGMIG

Just an additional note==Some members have stated the guns on these panzer's shoot harder than a HL tank,after taking apart the gun mechinism the reason for this is obvious because the internal plunger spring is a lot heavyer than one in the HL guns.They do shoot harder. BIGMIG