Good afternoon, not been here for a while but have some spare time now and was thinking of tinkering with a couple of project rifles. I was given a rather rough looking 0.22 Diana 27 a year or so back, and was wondering if it is worth investing a little time and effort in as a light weight ratter. It chronos between 6.8 and 7.5 ftlb and I was wondering what one of these should do with a good lubrication service without any modification to internals as an indication of its general health?

To help identify it, it has "Diana Mod 27 made in Gt Britain" across the rear of the cylinder with no visible serial numbers. The rear of the cylinder has a knurled, domed cap that unscrews to reveal the internals. I believe it to be post war possibly mid to late 50s.