Shim recommendations:

To achieve a perfect seal with your replica, you can easily adjust the kit using the shims already installed on it.
This system has been designed to be as simple as possible: thanks to the height adjustment, you don't have to worry about small tolerance differences between parts.
The kit thus fits many Glock-type replicas, including custom models.

And to make things easier for you, you can simply use the shim configurations shown in the table below.
The configurations presented serve as a reference: you can of course modify them according to the tolerances or specificities of your replica.

(Shim adjustment must be done on both sides, using the 0.5mm and 1mm shims provided.)

Remarks :
If you add too many shims, it will block the replica cycle.
Conversely, if there is not enough, the attachment will not be tight enough and the cycle will not be complete.
Experiment to find the optimal configuration for your replica.