Advice on buying a nail gun?

I wish to buy a nail gun to fix a very large number of 3'x 1' batons to 15mm boarding. There seems to be a large choice and I'm afraid I do not understand the terminology. What is the difference between a finish nailer, framing nailer, first fix, second fix and angle finish. I do not want to buy an... show more I wish to buy a nail gun to fix a very large number of 3'x 1' batons to 15mm boarding. There seems to be a large choice and I'm afraid I do not understand the terminology. What is the difference between a finish nailer, framing nailer, first fix, second fix and angle finish. I do not want to buy an over specified tool nor do I wish to end up with a toy. Any advice would be welcome. Thanks
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