AR15 BABY--all the way
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But if I had to take any sniper rifle into battle, not knowing the circumstances or whatever, just as a general all around sniper. The M21 gets my vote. As much as I LOVE my AR, the M21 I feel is a better all around sniper rifle. I don't know the changes on the M25 (just the synth. stock?) but I know the M21 is a proven rifle and would/will preform.Different situations will give you a different result.