I use a Tier 1 Concealed AGIS rig. On their website it says for GEN1 but my Gen2 fits. I did have to back the hardware out a tiny bit and used some Vibra-Tite V3 on the screws. Never used the 4brothers holsters, so I can’t comment on those.

 

IWB or OWB…..SIG website has holsters.

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I have a Gen 1 and it wasn’t an issue at the time, I’ve had good luck with my Tulster. I bought it off Amazon as I wanted easy return if I didn’t like it.

I got the polymer clip later, the metal clip I ordered it with made it difficult to get on and off my belt. I leave the gun in the holster putting it on and off my belt.