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UPDATE: New Form List (perk/holdout compatibility) update method that works for games in-progress. Can't believe I overlooked it. This is what I get for coding at 3am. The new method works regardless of what other mods you have running, even ones that modify what weapons are affected by the related lists (Professional/holdout).
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The Weathered 10mm Pistol, available with the Classic Pack, is quite possibly the BUGGIEST of all the pre-order weapons. Bethesda attempted to fix one of the major issues - the errors when applying weapon mods to the weapon - but if anything they've made things worse: the Weathered 10mm Pistol now does not show ANY weapon mods when applied, and is resistant to efforts to fix it through modding.

This fix addresses the above problem, along with a few other issues. Below is the full list of fixes:

1) The Weathered 10mm Pistol will now show the appropriate shape once weapon mods are applied to the weapon; this DOES include the third-person (in-world) view of the weapon. (see the notes section at the bottom of this description)

2) The increased Sneak Attack Critical damage from The Professional perk now applies to the Weathered 10mm Pistol.

3) You are now able to sneak the Weathered 10mm Pistol into casinos (and The Fort) as a "holdout weapon". (Sneak 50 or greater required)


NOTES:

THE WEAPON MOD PORTION OF THE FIX WILL NOT APPLY TO GAMES THAT ARE ALREADY IN PROGRESS WITHOUT USING A SINGLE CONSOLE COMMAND. This is because the model fix is accomplished by giving you an entirely new version of the weapon, which only occurs at the beginning of the game. To get this weapon OUTSIDE the beginning of the game, hit tilde (~) and use the following command:

player.additem xx001375 1
(xx will change based on your load order)

You will need to exit the game completely and restart in order to re-enable Steam achievements (if you care about that sort of thing).


THE PERK/HOLDOUT COMPATIBILITY FIX WILL REMAIN IN PLACE AFTER UNLOADING THIS BUGFIX. If you save your game while this bugfix is active, then restart the game without it enabled, the Weathered 10mm Pistol will remain affected by The Professional perk, as well as be able to be used as a holdout weapon. (However the fixed version of the weapon will, obviously, disappear if you unload this bugfix)