It's a simple task, just make sure you have something under the "ears" on the lower. Otherwise you can bend the shit out of them when you are pounding in the rear pin.
FWIW, I have put 7 of them on my personal guns. You will be happy you got one.
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Just be careful you dont break the ears off, Put something under it and put masking tape all around the trigger guard to keep from scratching it in case the hammer slips.
The primary difference I see between the 2 versions on Rainier are:
1. The screw in type saves your from the chance of breaking the ears off.
2. The screw in type does add a nice look to the gun.
The only Con I could envision is if you don't threadlock the screw in type. If you shoot a lot a screw "might" back out, and that's a big "might" since it is kinda out of the way of most moving parts.