The early type is a bit basic, but reasonably well constructed. It uses a Zeiss 4 power scope with La Coruña markings (either scrubbed and remarked or bought from Zeiss without and German markings). The scope mounting system is a bit odd, but again functional.
The late pattern of M43 sniper is truly awful. It uses a cheap Japanese-made 10x "Marine" scope (this being in the days when Japanese optics were very poor, unlike today). The mounts are a conglomeration of spacer blocks crudely welded to the receiver, bits of aluminum Weaver rail, and cheap thumb-screw scope rings. Honestly the worst actual military sniper rifle I have ever seen. And yet, they were formally adopted and used in Spanish military service for many years.
VIDEO HERE (10:35 minutes)