Hi Patrick, This is the one you're going to need - budsgunshop.com/catalog/product_info.php/products_id/23864/Butler+Creek+Adjustable+Black+Sling+w%2F4+Elastic+Cartridge+Lo
I love my shotgun but I bought it at a pawn shop and when I took it apart after shooting it I found that the piston was broken on the inside, I can't seem to find any parts online to replace it? Is my gun useless now?