go with an old jean jacket and some jeans with a black t-shirt and a mullet n you'd be pimpin the only 80's narc kit I'd know of
Oh and I'm not sure it a sawed off version would be precise nam kit but I find it looks good enough strapped to a back that I plan on getting one for mine.
If I recall I believe I've seen pics of a sawed off in nam but I'm not positive.