simple 8 shot ring cap impact grenade (v1)

I made this lightweight and simple airsoft impact grenade for the 8 shot ring caps (for one). This is really simple as I said and you may need to file the top of those notches on the moving part a bit. Also you may need to heat the nut to get it in the housing. You need M3 x 8mm screw with a nut and a m4 x 20mm screw also with a nut. The spring is 18mm long 10mm wide and when its compressed its 4.5-4mm the wire diameter is 0.7mm. I will improve this design and right now I cant guarantee for it to work. I used pla+

You arm it by pressing the moving part down and twisting counter clockwise. I do this with some pliers but I will probably make a tool for it too.

Please help me improve this in the comments. Thanks!