Good choice, I love my little T bolt mouse gun although it is no better than the cz .17 I’ve also got it is a bit posher, go for the 16” and put a slightly longer sound mod on it ( just to make it look better, dpt do a nice one for about £90 ) you won’t really notice the barrel flip on a .17hmr no matter the length, so you can’t blame that for any misses, also go for synthetic stock because they have a lovely little touch where another mag fits in the stock, as far as I know they do them in 16” and 22” I’ve never seen a 19”, when I got mine they only did it in 22” left handed so I had it cut d