[VEN]

Change fm_is_valid_ent(entity) to pev_valid(entity) and then you don't need to #include <fakemeta_util>

You better use engfunc(EngFunc_WriteCoord, ...) instead of write_coord(...), then you don't need to round vectors.

Also for example i do not see how g_shotgun_shot_particle_number[] is useful here. Snippets/tutorilas is to show you some scripting aspects/technique. You have to read and understand it not just copy/paste code blocks.