Thank you. That one's a store-branded 20 (made from 1930 to about 1940). About the only version I haven't tracked down and tried is the 520a version (single hump) in 20-gauge. You may have to pony-up for a parts guns if what you need isn't available anymore. Also, what parts you find may need to be field-fit (ie. hand-fitted) to your particular version of the gun.

Last edited by Lloyd3; 08/30/16 08:57 AM.