Hikermor... a good light would be my first recommendation, preferably one that can attach to the barrel, and if not a hand held light and shooting support position that keeps your hand away from any cylinder gap escaping gases,... a P60 hand held size (similar to a Surefire 6P, LED powered by 1860 or 2xcr123)

I looked for production mounts for SW K and N frame (couldn't remember what a M27/28 is)


I'm not recommending this particular product, but something like this copy of a GI M16 mount (ideal if you could find one) a couple of wraps of tape to protect your barrel, and a clamp on mount that could take a 1913 (Picatinny) rail, or a 1" flashlight body

https://www.ebay.com/itm/Tactical-Barrel-Mount-Adapter-25-4mm-Ring-Rail-for-Scope-Sight-Laser-Light-Torch/401840058042?hash=item5d8f88aeba:g:Q~kAAOSwx6Za8Bwi