I don’t know where you would be able to find that part. Your best bet would probably be to buy a parts gun on eBay. I bought one that needed resealed on eBay for 60 bucks. But I’ve seen some that needed more than that with a best offer on them. I always tell people on there that I’m taking a risk of it working even if I do have to repair it. Sometimes there’s more involved than what it shows in the pictures.And sometimes you can find them that are missing the Rear sight or the grips. I haven’t looked on there lately but I remember back when I bought mine I seen several every month for sale.