A stock block is used to fix a collapsible and or folding stock in place. A stock block is an essential component of a Featureless rifle in California. In California, a semi-automatic rifle with a detachable box magazine cannot have a collapsible or folding stock.
California legal Featureless FN SCAR 16S 5.56 FDE RIFLE with stock block. Available from Cordelia Gun Exchange.
Tan FN Five-seveN FDE 5.7x28MM PISTOL. Available from Cordelia Gun Exchange.