Recoil spring guide is two pieces, it has to be juggled to fit back in. Three hands and steel fingers would really help. Guys online will say it's not that hard after awhile. I have not found it so. It is an elegant sort of rifle and slings those 7.62x54R rounds down range with alacrity. It is a bit delicate feeling though compared to a Garand. They have become so valuable that I am leary to shoot it much.
There is a rail on the receiver cover, notch at the rear and a cross pin to keep it in place. I have a brass buffer that i made to wrap around the cross pin to keep from peening the notch. Many early SVT had the rail, only the sniper versions had the notch. Faking the notch is a major issue in the milsurp market. Anyway, the scope stays put. Scope and mount are replicas. Original scopes can be found fairly easily. Original SVT scope mounts are unicorns and sell for ++++++$.
If you ever get a chance to field strip an SVT and a FN-FAL the similarities of the recoil system are striking.
A friend's dad in highschool had one. He just refused to shoot milsurp ammo through it to avoid having to clean it. I do remember thinking it was sort of "delicate" as well. Always wanted one, should've thrown down when they were $600-700.