the mountmaster IMHO are not particularly well made. I'm sure they'd be functional, but I'd honestly prefer to buy from higher up the range (even the lowly gameking is better) if getting something new, or hawke (but not the low end vantage) as suggested.
Hmm.. there's a pattern here.. the absolute bottom of the range (cheap mountmaster and cheap vantage) from two decent manufacturers are both a bit pony...
However scopes are very much dependant upon your eyes though, so if you can have a look through one in similar conditions to where you'd be using it, that would be ideal.
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.