Sig 556 R Stock Block
This Sig 556 R stock block is used to prevent the folding of the stock on the Sig 556 R rifle. This is necessary in cases where the overall length of the rifle would otherwise be less than the California minimum of 30″ when folded. The block is installed inside of the spring behind the stock release button and prevents the button from being depressed.
Sig 556 R Bullet Button®
This Sig 556 R Bullet Button® holds the lock body in place with two set screws. It is made of billet aluminum and anodized.