The 1" wide Caps are for the medium frame Glocks (19,17,22 etc) The 1.125" (ie. 1 1/8") wide Caps are for the larger frame Glocks (20, 30, 40 etc) which will come at a later date.
If you ever have any questions on which Cap to choose and are not sure, you're always more than welcome to contact us as we can guide you through the process.
Some hand sanding may be required for a flush fit*
An IP15 is needed for install
**Does not fit a Vortex Venom optic cut**
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