Day 4 - Saturday 17th, March
Some more progress, we're waiting on a shipment of some bits before we can full conquer the internals
Drilling out the front end for the outer-inner barrel:
Drilling the screw holes for the bottom plate:
The bottom plate will hold the piston so it needs to be removable, heres what it looks like with the screws in.
We mess about with the internal design and despite a leaky test rig get a reasonable ~300fps from compressed air. Holding the piston while it recoils is an experience :D
(^^ over £600's worth of stuff in that photo :O most of which was borrowed or found in a bin :P)
MadDog welds the outer-inner barrel on: