I put a Mojo peep sight on mine, it replaces the rear sight without any mods to the rifle. It's too far forward to be a real target sight but it's about a 100% improvement over trying to line up the original open rear sight. It's adjustable for w&e so there's no problem sighting in with any ammo.
Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
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