On the official Nasdara map, the optic BUISOptic cannot be attached to the SCAR-L

(class SCARL / SCARL_Black). The attach action is not offered at all, as if the weapon

had no compatible rail.

The same optic attaches normally to SCAR-H (SCARH / SCARH_Black), to M4A1, and to any

other weapon that exposes a "weaponOptics" slot.

Root cause (found by extracting the shipped configs/scripts from the 1.30 stable client):

1) dta\scripts.pbo -> scripts\4_world\entities\itembase\inventory_base\buisoptic.c

BUISOptic.CanPutAsAttachment() uses a hard-coded whitelist:

if (parent.IsKindOf("M4A1_Base")) return true;

if (parent.IsKindOf("SCARH_Base")) return true;

return false;

IsKindOf() evaluates the CONFIG hierarchy.

2) The Nasdara SCAR-L config (nasdara\addons\weapons_nasdara.pbo ->

firearms\scarl\config.bin) declares:

class SCARL_Base: Rifle_Base // NOT SCARH_Base

class SCARL: SCARL_Base

class SCARL_Black: SCARL

so parent.IsKindOf("SCARH_Base") is always false for SCAR-L.

3) The intent seems to have been the opposite: dta\scripts.pbo ->

scripts\4_world\entities\firearms\automaticrifle\scarl.c declares

class SCARL_Base : SCARH_Base

(script-level inheritance), but that does not affect IsKindOf(), which reads the

config hierarchy.

Slot compatibility itself is fine: BUISOptic has inventorySlot[] = {"weaponOptics"}

(addons\weapon_optics.pbo) and SCARL's attachments[] contains "weaponOptics".

Only the script whitelist blocks it.

1. Launch DayZ 1.30 stable, map Nasdara (official).

2. Spawn/obtain SCARL (or SCARL_Black) and BUISOptic.

3. Put SCARL in hands, open the attachment slots / use the attach action with BUISOptic.

-> No attach option for BUISOptic; the slot exists but the item is rejected.

4. Repeat with SCARH + BUISOptic -> attaches normally.

(Also reproducible in DayZ Tools Workbench with vanilla + Nasdara data only, no mods.)

BUISOptic should be attachable to SCAR-L, which has a weaponOptics rail and is

declared as part of the SCAR family in the scripts.