John Krider (1813-1886) was one of Philadelphia's most prominent gunsmiths during the nineteenth century. L. C. Siner & Co. was the successor company that continued Krider's business into the 1930s. This small collection of business papers documents Krider's and L. C. Siner & Co.'s gunsmith and sporting goods shop. It includes bills and receipts for guns, fishing equipment, ammunition, lumber, and other items sold in the store.