best weps for box/wall shot

I 'm just curious to know if all guns can fire bullets though walls/boxes, and which are better, is it as simple as the higher the power the better? I just purchased a ScarL and it just feels like I'm getting more kills with my M4 through walls/boxes...could just be me and this whole thread is useless but thought I'd ask anyway

...and of the guns that can (if not all of them) shoot through walls/boxes is it a linear decline in power of those shots through the boxes and walls...do you know what I'm tryin to ask here? I think I'm confusing myself a little :P

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