Pretty good guns...like all of them, will respond to a little smoothing but that work is easy to do yourself.
The .22 makes better use of the CO2 on an energy basis at about the same number of shots per fill, but if you are just plinking or semi-serious about target shooting, the .177 version might fill your needs just fine. Can's say that they is any real noticable accuracy difference...if shooting paper for score, the bigger .22 pellets can turn a 9 into a 10 just by the larger sized hole it cuts (which is one reason .177's are the only caliber allowed in most paper-punching competitions).
That rear sight is "OK"...have two, but neither has been in use for more than a couple of years and hasn't had the use needed to get sloppy.
TWO BIG Problems:
(1) Fustrates the devil out of you at first as the dirction markings are Chinese idograms.
(2) No graduated scale/markings on the sight...no "lines"....so no real reference.
Can cure those problems with new markings....ain't real pretty, but can use tape and a sharpie pen. I'll probably not notice any slack in the adjustments as I'm use to using old equipment and tend to "over adjust"....if i want 5 clicks right, will add in 8 clicks right and come back 3, which tends to minimize any slack in the system.
Stocks:
Personal preference. Find the standard match stock more comfortable for traditional paper shooting...and the thumbhole for field shooting (think the thumbhole makes shots uphill or downhill a bit easier, paper-shooting ranges tend to be level).
Accuracy;
Will find the first few shots after recharging to be a bit "off"...and of course, once the CO2 is near it's end, will find them dropping low...in all honesty, there are only about 40 real good shots in a two-cartridge fill. Others report more, but when you can tell small changes, it's time to dump it and start over. You might consider one of the bulk tank versions (check out the paintballer's...they'll know where to get bulk fills cheapest).
They are accurate...but not "match gun" accurate. Sorry...are a lot of fans, me included...but they aren't shooting in the same class as old technology match guns, much less modern ones. Won't notice it untill you shoot official targets...a .09" group looks pretty much like a .15" one, but when you add up 10's....
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Ever think about the CO2 tank/valve for your talon?