About halfway down the page (use the search feature in your browser) $32 plus shipping but it may not be in stock. They know everything about Mossbergs. I've bought a new stock and cartridge stop for my Mossberg 500 from them. Great family run business.
If if helps original part #1220 fits 340 342 350 352. I believe the 2384 part number is good also. Nice little guns pre 1975 mossberg made some pretty darn good 22s
Havlinsales all the way. And if you need parts not on the for sale page, call and talk to Vic or Cheryl. They get stuff in off and on that doesn't make the sales page just because they might only have one.