A while ago at a airsoft site near me,I found 2 used 6 bang training device grenades probably from some police or military training, my original plan was to keep them as paper weights as they are inert, my thoughts then went to, how easy it would be to make them useful again and looking at the mechanism I fiddled on with re drilling the old primer and fuse out and tried a new primer and what was basically useless. I then looked at my bfg (dynatex dominator) to understand how it worked and then the plan changed. To make them into a blank firing grenade, I drew a mock up for a bolt/ firing pin with basically a ball on the end for the impact part. I went to my local hardware store for some bits and cost £4.50, got to work assembling and drilling a whole for the safety pin to go all the way through so the firing pin can not touch the 209 primer even when dropped, firing only occurs when safety is pulled out and grenade is thrown to the ground where it’s hits the rubbed door stop connected to the firing pin and thus detonating.