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And gave it some barrel extensions and additional bits, would that pass for an autocannon in most accepted circles?

I'm speaking of the one which comes as a duplicate, the two on the right.

I'm thinking rather that instead I may convert just to a meltagun; could be easier - snip the tip, shave down the sight and toss on a melta tip. I've got a mess of these, and a solid 5 for a chosen melta squad is simple enough.

If it looks cool and looks like what it's supposed to be then it's fine.