I have an older model Valmet 412s skeet gun in 12ga. The gun came with a pair of skeet chokes but no other chokes . My question is is there a choke made for other guns that will fit my valmet . To help a little the thread pitch is 0.75 metric , the thread section is 0.715" long and is located o.325" from the bbl inner end. the choke id varies from .722 to 0.728 . which indicate a close to standard bore . the " measurements were taken with a dial caliper . any info on this will be highly appreciated. bill powers