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2 front posts + the rearward screws holes I believe.Thread Resurrection:
I want to get my Glock 21 milled out for an RMR. I was looking at primary machine do they flatten out the pocket or do they leave the mounting post and screw holes? I debated on which of my guns to get milled but am going to go with 21 bc I just love they way it shoots. I know caliber debate would come into effect but to me it is optimal.
2 front posts + the rearward screws holes I believe.
Not 100% on RMR... as my milling was for the Vortex Viper.
Shoot them an email. They were very prompt when I contacted them.