I've replaced sights on many a pistol in my day. When I made the transition to the P320 RX as my EDC, I longed for a spare (2 is 1, 1 is none; you get it). I found a P320 RX, NIB for a great price. It was a GB deal, and I bit. When I picked up the gun from my FFL, it had suppressor height sights, but they weren't night sights. It was still a good deal, so I bought some Trijicon Night Sights and decided to go to work. I have a Sig P-Series pusher, but I read that it wouldn't work. I have a dedicated Glock pusher, which I knew was not going to work. So I used a eBay sight pusher, that I probably shouldn't have used. It's just not that great of a pusher. Anywho, I get the rear sight in, no problem. Except that it left a mark where the pusher impacted the rear sight. I removed the front sight, and attempted to install the new Trijicon. But it looked warped. So, I sent the front sight too Trijicon. They replaced the from sight, but indicated that the damage to the sight was due to the fact that I installed it incorrectly. Specifically, they said I installed the front sight from the wrong side of the frame. Honestly, I don't ever remember that making a difference. But, you can learn something new every day.

My question is this; from what side of the slide should I install the from sight? I also bought a Vism Sight Pusher, which was actually recommended by Sig as being good sight pusher. I'm ready. Just tell me what side of the slide I need to start from.  Lastly, if the Vism pusher is crap, what sight pusher do you use?

For the TLDR crowd; what side of the slide do I need to begin the installation of replacement sights on a Sig P320 RX? Or does it make a difference. Also, if the Vism pusher is crap, what sight pusher do you use?

You could measure each side of the slot with a caliper if you are concerned that they are milled in some non-uniform way.

They come out from right to left as of you’re looking down the slide from the rear. I just put some xray suppressor heights on my rx compact. I use the mgw range master sight pusher.

Does that mean that they should be installed from left to right? Thank for the reply!

From the left side of the slide to the right.
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Yes