Opinions on Conversion Sight Rail

I have a circa 2002 Marvel Conversion with the Iron Sight Rail. It is shooting well and  I would like to mount a dot on it. The choices are the combo rail and the dot only rail. 

So...

Does anyone here use the combo rail? Do you like it? Does it do either irons or dot as well as the dedicated rails?


Thanks for any thoughts.

Groove it for 22 rings.

I just bought one and it hasn't got here yet  but with the option to add a dot without disassembly was my choice. the sights are the same on both styles, only difference is the rail milled in the center and its 15.00 more

A combo rail for the Marvel is great. 

In 45, I find the RRA combo rail too heavy.

Thanks guys, ordering ASAP.