I come to you of the new on pac's Auto!
This one has actually advanced both dressing as electronics!
I. The physical appearance:
First we start with the physical aspect of the beast:
The ultimate goal is to have something that is closest possible to the modeling done by me:

Currently I'm here:


This is a good start, but I still have a lot of work!
A little insight into the control interface:

II. The electronic part:
The electronics will be on two Breadboards
As for "bridges", they are made here with "straps", Ø0.5mm wire and bent using a small needle nose pliers

Now with the LCD and the 16 × 2caractères Arduino Uno:

III. Components and their functions:
Level electrical components is simple:
-A rotary switch for the fire selector (Configuration, Security, Semi-Automatic, Automatic, Burst 3coups).
-A potentiometer for adjusting the brightness of the LCD.
-A potentiometer for adjusting the rate of fire.
-A potentiometer for adjusting the contrast of the LCD.
-A microswitch for triggering firing.
IV. The piston charger:
The piston charger was reviewed.
It is made from copper tubing and a brass tube Ø4 × 6mm. A nominal body Ø6 × 8mm and a ring Ø12mm.

The guide is one of the piston tube Ø8× 10mm.
This one with a copper ring of Ø10 × 12mm which was machined to turn the poor so as to fit snugly in a nipple M / M 3/8 ":




The piston in its internal guide:

And all in its external guide:

A short video of the operation:
[youtube][/youtube]
V. Operation:
And of course, a video of the operation:
[youtube][/youtube]