I have one of the variety you can buy from H&F. it's OK mounted on big red handlebars but I find in tight places you will be smacking your barrel or butt or both on scrub unless you use a short rifle.
I saw another bloke use a mounting system wherein he has the rifle mounted under his thigh, alongside the engine angled from toe of his boot sloping upwards towards the back carrier of the bike. It may be worth thinking about building a semi vertical carrier / rigid gunslip / scabbard that fits from behind your heel sloping up just in front of the rear carrier frame.
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