I reckon I've seen this gun before there was a thread about it a couple of years ago, it has an Innova pump, custom bolt action breech and a reddish coloured stock on it --- it looks very much like a Sharp Tiger with custom breech to me.
It was sold on here, so if you've bought it off a BBS member it should be possible to backtrack it through the search function.
Edit :- is this the gun ?
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Pictures originally posted by Partner K1250 on 12/04/17
All the best Mick