“By the way...What is a “battle rifle”?”
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Loosely defined, whatever rifle you are bringing to the fight, I imagine. More tightly defined, things like AKs, AR-15s and M1As - rifled infantry weapons actually designed for battles.
conceivably it could be anything from a 70-year old moisin nagant to an M1-Carbine to a ruger 10-22, a Winchester 30-30 or an AR-15.
Essentially, its what you have at the time it gets tense to shoot back at the bad guy. For us, a ruger 10-22, an SKS and an AR-15.