Yes sir, did it myself I bought the smallest tags and the needle inserting gun thingy. Studied LMB anatomy diagram found a void and went for it. used a void area since they didn't have enough meat up high to insert when they were 3s. I got extra fingerling thinking my survival rate would be poor but to my surprise went very well so I have been culling some smaller males right now to get to my LMB stocking number i want. The F1s I have tagged as I went only have like 4 more to go and just tagged one yesterday and tagging them in meat up high. Believe the pit tagging system is actually made for medical monkeys.