Looks interesting. Says it can take Magpul 308, AICS, and some M14 magazines. Uses AR-15 free float handguards and has an AR style safety.
.308 is 20"
6.5 Creedmoor is 24"
.243 is 26"
http://www.ruger.com/micros/rpr/models.html
http://www.americanrifleman.org/arti...ecision-rifle/
https://www.youtube.com/watch?v=cAimarSpHJY