Combat Engineer said:
Amazing... you send the gun back to the manufacturer and they say it is within spec, even tho it shoots 3.77" groups. Wow.
A 3.77" groupat 25 meters is
82 feet or 27 yards is not bad, particularly if not shot from a rest (like a Ransom Rest.) The
original poster talked about a much bigger (8'-10') group at a bit more than half that distance (15 yards = 45 feet),
which doesn't make sense unless it's a SHOOTER issue. Vertical stringing, which was mentioned, is often (almost always) a shooter issue -- and given the CZ lockeup design, not likely to be due to the gun. (As
jmr40 noted, much earlier, the gun has been shown to do better.)
Not addressed: AMMO. CZ uses Sellier & Bellot 124 gr. The OP didn't mention the ammo used. (I had a Beretta 96 once that would only shoot well with certain brands of ammo; it loved Fiocchi, and despised most other brands. I don't hand load.) I would try different ammo, if that hasn't already been done.
To the OP: do others shooting the gun have the same results? It sometimes takes me a while to get into step with a new gun; I have a friend who can drive tacks with any gun capable of that sort of precision, so I generally get him to shoot a new-to-me gun early on. His technique is awesome; mine take practice and work, and still isn't awesome. If a gun is giving me problems and he
can't get it to shoot well, I quit trying -- and sell it or trade it.
If others don't have the same problem, it may be one of those quirky things that some guns and some people just don't FIT together well -- and neither is to blame...
.