I bought a AYA model 4, 3” off a Holts sealed bid a couple years ago for under $150.00. Imported it and had the chokes opened up to .015& .025 which I like for steel. All told I’ve got well under a grand in a knockabout steel safe double for steel. AYA are very cheap in GB and easy to find one in excellent shape. It will cost more to import them and buy them. A Model 3 which is extractors is even more common.