I had to take apart as wasn’t working to find the slider had snapped along with plastic on wheel to had split , thankfully I had these from old gearbox and was able to get firing as gears are good,was going to complain but left too long before I tested
![[Z-Parts] Alloy Mk12 Steel Gas Block](http://www.sixmm.com/cdn/shop/products/img_0403.jpg?v=1613009979&width=950)
![[Z-Parts] Alloy Mk12 Steel Gas Block](http://www.sixmm.com/cdn/shop/products/5_140af32e-1f31-44e1-9664-b94358b0f6ab.jpg?v=1613009979&width=950)