The w_bm16.zip file you have requested: Shadow of Chernobyl / Mods / Sawn Off Sidearm - 2.24kb is not available. Perhaps try browsing all files for the game S.T.A.L.K.E.R. Shadow of Chernobyl and upload any files you want to share or are missing. This is the only information we could locate:
This mod changes the Sawn Off Shotgun to fit in the sidearm (Pistol) slot.