Its made for it. It is a weaver base and rings, with a Bushnell Banner 4 power scope ( perfect match by the way)
Late model 340's are pre drilled for the mount.
Mine was a earlier gun so was not pre drilled.
The mount is a Weaver side 1H.
I had a Gunsmith put it on. he has to relieve the stock and drill the holes.
Charged me 50 bucks. Was worth it. Its whole new gun with that scope.
All the old timer gun smiths around here are well versed on the 340.
He had done hundreds of them.