I Imagine a sunny day hunting in November with my Marlin SBL 1895. Yes, great rifle but, I believe the suns glare from my mirror like surfaces on this rifle can spook a wary buck. What to do?
Well, It depends. You can spray paint your rifle. Nope. You can buy camo duct tape, Cheaper, it works. Or buy some camo sniper veil to put on your rifle with elastic bands. Mossy Oak makes a gunwrap see
Gun Skins. They do not make a kit for my marlin but they should.

I chose to use camo duct tape ($9.00) and cut it to fit parts that would reflect the sun. Took me an hour.

In this case, it is most of the metal on the rifle. Big difference below! This reduced reflection greatly and the tape can be easily removed. 
One thing you want to avoid is getting your barrel hot from shooting practice. Your tape will get hot and gummy. So shoot a shot or 2 and cool your barrel making sure the tape stays in place. Mossy Oak Gun Skins is another great option see the blue colored print site above.
Update
In review, I had some “gun skin” tape, so I remove the duct tape from the barrel only and added the higher quality gun skin tape. It will handle barrel heat better if I practice at the range.
Good Hunting!