Get a rail mount that you install it in the rear sight dovetail. Get a red dot like a Vortex Viper which is one of the smallest ones.

 

Any idea where I could find one that doesn't involve milling the slide

 

Here you go..................
UM3 Sight Mount

 

The description of the item on the UM website says will fit all pistols with a 1913 picatinny rail. Since Sig actually puts a proprietary rail that is not actually a picatinny, I wonder if it will fit correctly.

Thanks for your help, btw

 

The P320 does in fact use a true picatinny rail.

 

having experience with dovetail mounts, avoid, not worth the headache.

 

+1 on no dovetail mount and the vortex viper.

I believe the vortex will run you about $225. My other suggestion is the trijicon rmr but that's twice as much. Honestly, I only buy vortex optics now, they are comparable to products twice their amount. Anything less I wouldn't personally consider buying. I could be wrong but I've never seen an optic for $150 or less that is any kind of good.

 

Thanks for responding

Looking at the Vortex sights per your advice. Do you think this Vortex Venom will work with this UM Sight Mount. The Venom is within my budget

 

UM3 mount works

I use the UM Tactical mount on several Glocks and it also works well on my P320C. I like the Burris FFIII 3moa but its a little more than $150. Might get a good used one though.

The UM mount is very repeatable from use/removal/reinstall. I like how it does not require pins to install. Open sights easy to use under the mount.

 

Should be fine the sight mount is 1913 and the sight says mounts to picatinny, my only concern would be Sigs proprietary curved rails, I'm not too familiar with the venom sight but I would toutube some reviews before buying. I've personally only had experience with vortex strike fire, spitfire, Sparc, and viper but I loved all of them

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Btw how do you like your 320, I'm thinking of taking the plunge into the world of striker fire

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I like it quite well. In fact, I traded my 226 for it and I thought I would never part with my 226. I just don't shoot DA/SA guns very well for some reason.

 

I love the vortex with the 320 styling. the RMR look like it was made for the glock. Not saying it is, just saying its about a perfect a match in looks you could have.