The upgraded case containment spring is a replacement with a longer tab on the end to hold the cases after they are pushed out from under the drop tube. The cases are held more securely and are recommended upgrades for earlier rifle conversion kits.
Tempered spring, refer to the Support pages for fitting and adjustment. Recommended for all rifle conversions supplied prior to June 2018. Standard fitment on all orders June 2018 onwards.
1 per box.