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  1. What Caliber is my Rifle Chambered for...?

    Technical Questions & Information
    Hey all. First time gun owner and new to the forum. Please pardon the insane ignorance in the question to follow. I'm just a bit confused and don't want to assume anything. I recently purchased an 18" Armalite M-15 Tactical. The dealer I purchased it from had it listed on their site as being...