I have a 509 on a pistol and love it if that helps. I'm sure with the right mount and correct height it would be awesome on the rifle.
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If you were leaning towards a scope, I would suggest a Leupold compact 2.5x over a LPVO for cost and weight savings with minimal loss of utility.
I am no help at all on the MRDS front.
Andy
RMR type red dot on a very low profile mount on my Henry steel Big Boy carbine in 41 mag.
Love it, I did not want the weight and size of a scope screwing with the balance of my carbine.
Older Big Boy Steel .357 before the side load gate. EGW mount and a Venom. It is a lot of fun.
https://i.imgur.com/rhDnOkc.jpg
I have a Big Boy X in 45Colt. Tried and LPVO at first and did not like the balance and plus the fact that this carbine is for close in deer. Put a Sig Romeo on it and love the set up.
EGW Sight Mount For Burris Fastfire, Vortex Venom & Viper for Ruger PC Carbine(also specified for the Henry big boy, also sold under Henry label)
Vortex Venom Red Dot Sight (3moa variant)
Mountsplus.com had a special where you got the mount for free if you bought the Red Dot.
I'm quite pleased with the vortex venom, though I know there are a bunch of people who will tell you the 507 or similar is better. But for the special I decided to give it a try
It's a very effective combination on a carbine and adds almost no weight or bulk.
Ya got me thinking, LOL. I have a Sig Romeo on an AR upper that I have not shot in ages so it's just sitting there,, I also have a Holosun kicking around. I love the 1x8 scope but when you and others talk about weight/balance I think I would be better off with the RDS for sure. I don't hunt with this rig so just range and goof around stuff. I'll keep ya posted when I do the switch!;)