If the ONLY place that vertical foregrip can go is on a pistol, NO rifles/shotguns you own have rails, etc., then yes it can be considered constructive possession.
However, as stated already, you'd have to be doing something seriously wrong already (showing up at a range with the foregrip on a pistol, for example) for any attention to be given to the foregrip itself if it does nothing but sit in a box or go on a long arm.
If you have no other legal use for it, and own only one firearm, a handgun with rails, and have the foregrip, yeah, that's pretty clear what you're intending to do.
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