9x39mm SP-6

 is an ammunition that appears in S.T.A.L.K.E.R.: Lost Alpha.

"An armor-piercing round for the Tunder S14 and the VLA Special Assault Rifle assault rifles and for the Vintar BC sniper rifle. It has a subsonic bullet which due to its special design can penetrate most bulletproof vests at a range of up to 400 meters."

- Inventory description

Overview

 * Subsonic AP round for the Tunder S14, VLA Special Assault Rifle, Sniper VLA and Vintar BC, and the Big Ben pistol.