As mentioned before the "10-series" rifles are short action (10, 11, 12, etc) with the second digit denoting finish.

http://www.stockysstocks.com/servlet...e-stock/Detail

http://www.stockysstocks.com/servlet...ies-M24/Detail

I personally have the M24 style under my 10FP-HS and love it, and as soon as Northlander gets back to me, I will have the other stock under the 12LRP I will be ordering.

Welcome, and enjoy.