wink man is correct, the Savage 24's use the Winchoke thread system. If you have any old chokes for Winchesters or H&R's, Mossbergs, (not the 835's) por Brownings, (not the Invectors) thet should fit. My buddy has a 24F and choke the tubes that cam with it fit terribly, we got a tiube for a Winchester 1200 and it fit great, a tube from a Winchester 1300 fit terribly, felt cross threaded just like the factory tubes. However the Winchester 1200 and 1300 tubes worked in each gun!!!! Figure that one out, anyway we got him a tube to perfectly fit his 24F from a Winchester 1200....<><....