Re: can of worms marlin/ vs cz
Never owned a CZ but have run my 880SQ hard with whatever ammo
I could get my hands on and have been very happy with it. It easily shoots sub MOA at 50 yards and damn close to it at 100 yards minus the occasional flyer and wind gust. Over the years I have done a few things to it such as: new trigger spring (out of an ink pen), polished up the trigger (did it myself), threaded the barrel for my AAC Pilot ($20 + A1 flash hider as a thread protector $4), dropped it into a Boyd's Tacticool stock ($79) and just today got a picatinny 5 MOA base for it from DIP ($40) (slides on the 3/8" groove but I will have to drill and tap the receiver as the base is really made for the 900 series Marlins), set of TPS rings (used $20) and a Tasco 2.5-10x50 mil-dot scope (on sale through Midway years ago $69). Pretty sure I bought this 880 for around $180, so for a little over $400 I have a great shooter with all kinds of accuracy potential. If I was willing to spend the money on high end .22 ammo I know it will shoot with the big boys. There are after market triggers for the Marlin as well but I will need to save some more for that. It is apart on the bench to be drilled and tapped and I will post pictures when it is back together. If you have a line on an 880SQ for a good price I don't think you can go wrong.
Another option is to look at the Savage line of .22 bolt action rifles. They have some new tactical models with features you may want to upgrade to anyway. I bought my oldest boy a Savage at it has run without flaw and is easily a MOA gun at 50 yards. Let us know what you end up doing.
Danel