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] 15 inch Handguard for VIPER Mk16 GBB (Blk)](http://www.sixmm.com/cdn/shop/products/mk16-15__-black-nut-1-003_64b2cea2-404f-4409-b3ac-0e8ca6ab3d92.jpg?v=1611809603&width=950)
![[Z-Parts] 15 inch Handguard for VIPER Mk16 GBB (Blk)](http://www.sixmm.com/cdn/shop/products/mk16-15__-black-nut-1-004_e765c6b2-9589-4318-9177-8f9622561656.jpg?v=1611809603&width=950)