GP-25 Kostyor 40mm underbarrel grenade launcher

There is NO purchase option unlock for this launcher on Mechanic despite the flea market having a listing for it. This is a leftover from the event quest Failed Setup.
The (GP-25) is a underbarrel grenade launcher in Escape from Tarkov.
==Description==
An underbarrel grenade launcher for 40mm VOG-25 grenades, designed for installation on all full length AK automatic rifles.
==Notes==
* Cannot be listed for sale on the flea market.
* To use the GP-25, press the hotkey (e.g. 2 or 3) for the weapon it is attached to, while it is in your hands.
==Mods==
Can only be installed in combination with:
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Conflicting items
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==Trading==
x1Intelligence folder+ x2OFZ 30x165mm shell	→	Prapor LL3After completing his taskBest Job in the World	→	
GP-25 Kostyor 40mm underbarrel grenade launcher
==Trivia==
"Kostyor", the project codename for the GP-25, translates to "Bonfire" in Russian. 
Category:Underbarrel grenade launchers
cs:Podvěsný 40mm granátomet GP-25 "Kostyor"
fr:Lance-grenades monté GP-25 "Kostyor" 40 mm
ru:Подствольный гранатомет 40мм ГП-25 "Костер"