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AR15.COM
2/10/2017 7:58:52 PM EDT
What do you think is the better mounting system for a red dot so I could try it out with out milling the slide. Thank you
2/11/2017 3:57:45 PM EDT
[#1]
For trying out?  Probably the RBU.  

It's cheaper than the MOS, is made for a few different mini red dot sights, comes with iron sights built in so you don't have to buy sights too, makes no permanent modification to the gun, and can be installed on any generation Glock which means you can buy whatever deal you come across instead of having to wait for a MOS gun specifically.  

The RBU isn't perfect, but it's very good for what it is.  You may even find you like it enough to keep it permanently.
2/12/2017 3:24:10 PM EDT
[#2]
I would purchase an MOS gun just because the optic will sit lower than on an RBU. Having an optic too high over the bore makes the experience not as great.