Part Number 12991533B having (CAGE Code 7Z500) and FSC 5310 Nuts and Washers in stock with ready to ship. Get an instant quote for 12991533B Washer Bevel by Bushmaster Firearms International Llc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.