Yep, I found a solution for my charger problem. It's not a new solution, just the overly long one I had in mind when started rebuilding the non-case parts. It makes the gun very large: 43,5 cm of which only 1/3 is the actual chamber (stock not included!). 2/5 will be shared by stock and the triggers, making it look like a Tompson without stock. *sigh* Seems that a proper proper with long and hard to trigger cartridges doesn't make a small Lego gun as it seems. However, this one will be very, very reliable to operate. When it's finished, I'll need to modify the bullets for higher accuracy. Or atleast create a loading bench so that there's no stupid bullet misdirection when charging.