Got an STI 1911 on the way, my first 1911.

 

Have found some aftermarket grips I like for it.  Can I assume all 1911 grips are interchangeable, or do different manufacturers/models have different sizes?

I'm pretty sure they are standard amount the sizes. The only one I think that's different if the smallest frame size.... officer I believe

 

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What ataimwolswol said. All the same size except the officers is smaller.

 

Must take into account things like a single sided or ambi thumb safety and whether you want the bottom of the grip radiused or not. Also, if you have a bobtail then its a differrent cut at the back to fit that frame mod.

What STI? I like the grips on my Trojan

What STI? I like the grips on my Trojan

Duty One

Check out https://vzgrips.com/pistol-grips/1911

What ataimwolswol said. All the same size except the officers is smaller.

 

Must take into account things like a single sided or ambi thumb safety and whether you want the bottom of the grip radiused or not. Also, if you have a bobtail then its a differrent cut at the back to fit that frame mod.

 

This ^

 

One thing to add; there is also a slim grip that does not support the plunger tube. Most people would probably recommend you keep that support, but it's up to you. Aside from that, the grip screw holes should reliably line up.