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] 13.5 inch Mk16 Handguard for WE M4 GBB Rifle](http://www.sixmm.com/cdn/shop/products/systema-m4-011-01_9357bc12-f5d7-4286-aacf-4618577f539d.jpg?v=1611807622&width=950)
![[Z-Parts] 13.5 inch Mk16 Handguard for WE M4 GBB Rifle](http://www.sixmm.com/cdn/shop/products/systema-m4-011-02_8025bde5-8fc5-4b38-b947-956c00b12cfa.jpg?v=1611807622&width=950)
![[Z-Parts] 15 inch Handguard for WE Mk16 GBB (Blk)](http://www.sixmm.com/cdn/shop/products/mk16-15__-black-nut-1-001.jpg?v=1611809888&width=950)
![[Z-Parts] 15 inch Handguard for WE Mk16 GBB (Blk)](http://www.sixmm.com/cdn/shop/products/mk16-15__-black-nut-1-002.jpg?v=1611809888&width=950)
![[Z-Parts] 9.3inch Mk16 Handguard for WE M4 GBB Rifle (Tan)](http://www.sixmm.com/cdn/shop/products/3_dc70a0fa-c516-4f62-bb56-a85be22c9cbc.jpg?v=1611813108&width=950)
![[Z-Parts] 9.3inch Mk16 Handguard for WE M4 GBB Rifle (Tan)](http://www.sixmm.com/cdn/shop/products/4_47b659e7-268d-48d6-ba58-9740033f39db.jpg?v=1611813108&width=950)