What causes the Tactical Stock mod for the Commando 553 rifle to show up as giving a -1 to the Concealment stat and give no bonuses? Don't weapon mods (except sights) give at least 1 bonus to a weapon stat? This is the only non-sight weapon mod I've noticed that gives a penalty and doesn't give a bonus to a stat. Is this mod purely for aesthetics only?
A post in the Reddit /r/paydaytheheist subreddit suggests that it increases a hidden stat. Can anyone confirm or deny?
In case it matters, my Commando 553 rifle also has the ff. mods equipped: Long Barrel, 'Fire Breather' barrel extension, 'Auto Fire' custom mod, Enhanced Foregrip, 'Tactical Laser Module' gadget, Enhanced Grip, 'See More Sight', 'Heat Treated Body' upper receiver. I tried changing some of the mods, but it seems this does not affect the penalties of the Tactical Stock mod.
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Source: The Long Guide http://steamcommunity.com/sharedfiles/filedetails/?id=267214370