I carried a Beretta 21 for several years while working as a Security Guard. It was completely reliable for years, until one cold winter day when it just quit working properly. I sold it to a friend who had it up and running quickly...but only with 31 grain Federal hp's..!?!
I have a Smith 2213 .22lr that is spot on accurate, reliable and only a bit larger than the 21a. Find ya one of those! You won't be sorry!
dakasat