RE: red dot sight on muzzleloader??
Cayu I'll have to check on that later this week when I get back into work. I know TruGlo actually builds the majority of the red dots on the market. I have a 45mm TruGlo on my 835 Ulti-Mag and it looks just like the one in your pic. I also have a 3 dot red dot on my Ten Point TL 4 Titan and it too looks just like a TruGlo product.
As for the question about their durability. I can assure you that I haven't EVER fired a smokepole that rivals the beating my 835 dishes out. I shoot 3.5" 2 1/4oz 4x6x7.5 HeviShot Nitros in my ol Mossberg and it treats the scope and shooter like the hammer of Thor! I wouldn't hesitate to put one on my smokepole. Personally if I were going to put a red dot on my ML it would probably be the 2x red dot that TruGlo has out. We have a few in the store that we put on some crossbow packages and they are really neat for folks with bad eyesight or at longer distances. They would be great for shooting over 100yds IMHO!
Good luck,
RA