Building AR-15, what length barrel should I get?

Well I either want a 16" or 20". I'm leaning more towards the 16" because I want my AR light and I like the smaller/shorter guns. I would be doing some hog hunting and would like to shoot pretty far. I know you have higher accuracy with the 20" but how much better than the 16"? Would I... show more Well I either want a 16" or 20". I'm leaning more towards the 16" because I want my AR light and I like the smaller/shorter guns. I would be doing some hog hunting and would like to shoot pretty far. I know you have higher accuracy with the 20" but how much better than the 16"? Would I be able to tell? Im going to be shooting a .223/5.56 nato. I'd like to hear your opinions! If you have any specific brands that you like let me know! Thanks
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