Irisblende STGW90

Size Adjustment for Iris Diaphragms

Please keep in mind that, according to information and tests conducted by top shooters, it is generally not recommended to shoot with a setting smaller than 0.8 mm. Most eyes cannot perceive an opening smaller than this as round. The hole appears damaged, dirty, or deformed, but in reality, the problem lies with the eye.

Installation Instructions

Using a size 3 screwdriver, unscrew the insert from the diopter drum (starting from the muzzle end)

Carefully screw the iris diaphragm body in from the muzzle end until it stops (do not tighten!)

Now unscrew it back until the arrow on the diameter scale points upward for the first time (this mark will later indicate the set size)

From the piston side, screw on the hex washer and tighten it gently with a 15 mm open-end wrench.

The iris diaphragm must not be blackened. The iris will also be damaged by compressed air, needles, and similar objects

Cleaning the Iris Diaphragm

Open the diaphragm fully.

Blow through it with your breath (compressed air pressure not to exceed 2.5 bar).

Check the result by not aiming through the aperture, but by focusing your eye on the aperture hole and looking at a bright surface.