Confused about my Bear TD-HELP please

[Werewolf]

Hey guys ive got a new Bear A handle and a slightly older set of bear limbs (guessing about 5 years old they are FF) that are not maked "1 or 2 or 3".when put together they make a bow thats 52" in actual length.Looking at limb combinations in 3rivers I see no setup that makes a 52" bow.I see a A riser and #1 makes a 56" AMO bow.What am i missing?feel like a moron asking but could you explain this to me.
I think I gonna need a string thats 48" right?

[Jack Shanks]

The Amo is measured following the curve of the limbs. Most recurve bows will be about 4" shorter when mearsured tip to tip unstrung. Your bow will take a 52-52.5" string.

[Werewolf]

thanks Jack that solves it.