AA12 from Western Sahara CDLC shoots far below its crosshair when using any attached sights

[SVX-0]

Mods (complete and add to the following information):

• Arma 3: 2.20.152984 (Stable)
• CBA: 3.18.4 (July 15, 2025)
• ACE3: 3.20.1 (November 11, 2025)

Description:
Whenever the AA12 from the Western Sahara CDLC (officially AA40) has any sights attached, for example the Leupold Mark 4 HAMR (officially RCO), the rounds fired from the weapon impact far below the actual crosshair with the distance increasing in relation to the zoom level of the sight. The weapon is considerably more accurate when no sights are attached.

Steps to reproduce:

1. Launch the title
2. Enter the Editor and select any map
3. Select any area, preferably one with nearby buildings
4. Place any soldier template and equip it with the AA12 shotgun, slug ammunition, and the Leupold Mark 4 HAMR sight
5. Play the scenario to gain control over the soldier
6. Ensure the main scope of the equipped sight is active
7. Shoot at any preferred nearby target
8. Observe the impact location of the fired projectiles

Expected behavior:
Projectiles impact reasonably close to the actual targets selected through the equipped sight.

Where did the issue occur?

• Singleplayer / Editor

Log Files:
https://pastebin.com/nKPkfkb8

Additional context:
The issue was also verified to occur on unchanged, default ACE settings.

Screenshots:
Video

[rekterakathom]

I can reproduce this, and I've determined the cause to be Advanced Ballistics combined with Correct Zeroing (ACE Scopes).

Edit: added info that Advanced Ballistics has to be on

[Laid3acK]

Try vanilla game only with the same weapon, same ammunition, same scope, same zoom, target distance 300m, before to make an issue relative to ACE3.