I have a Marin semi auto and like it a lot. I know they make a bolt for a reasonable price.
Good luck and good shooting señor.
ps.I had to dissuade a co-worker the other day from buying a .17 as his first gun. for just plinking I see no reason to go .17 over .22.
"I have ridden the mighty moon worm, and it was good"
"Aim Big miss Big, Aim small Miss small"
"Don't rush the monkey and you'll see a better show."
- T. Boone Pickens