As per request this is just to make the long barrel for the pistol to be standard size.
Texture link if you wish to have Covert Pistol Matte retexture by Spartan431Aarijan

Install by placing folder in fallout 4\date

Be sure to edit your fallout.ini by going to Users\Owner\Documents\My Games\fallout 4
ResourceDataDirsFinal=STRINGS\, TEXTURES\, INTERFACE\, SOUND\, MUSIC\,
VIDEO\, MESHES\, PROGRAMS\, MATERIALS\, LODSETTINGS\, VIS\, MISC\,
SCRIPTS\, SHADERSFX\ where it says sResourceDataDirsFinal then save and
you should be set.