Caldwell 30 3 FR - Please Identify. I would like to order four of them.

Hey there!

With this combination of attachments, you could have either an S380-31 or S385-31 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. If your stamp reads "30 3", then you'll need a 3030 stamp option. 

Let me know if you have any questions!

Comparison of the S378, S380 and S385 balance shoes.