Which GBB pistol is most accurate?

All of them, and none of them.

Accuracy tends to be a huge collection of factors, and pretty much any pistol can be made more than accurate enough. If you're sweating over the millimetres, then the only advice I can give for maximum accuracy is to find something that has a good quality aftermarket TDC hop unit, an outer barrel that doesn't move around too much, a good hop bucking, and probably a 6.05 or 6.08 inner barrel (as a 6.23 widebore would likely see a significant dip in power on a GBB pistol that would actually hurt the accuracy). If it was a target pistol, I'd make sure the hop setup can handle it, then run .48s through it for the most consistency in the BB flight path, but I wouldn't do that in game because it's my opinion that people who run .48s in pistols are being a dick, and the golden rule of airsoft is "don't be a dick". In game I run .32s in my pistols for the trade off between performance and etiquette (and cost!)
 
There is no overall winner.
Longer barrel helps but there is variation even between the same model
 
I only do indoor target shooting
You want something without a hop up (it imparts back spin onto the projectile to get more range but very inaccurate for target shooting) and something that uses Co2 or Compressed Air so you can push the power.

Honestly an Air Pistol such as those that take a rotary magazine https://www.thewolfman.co.uk/air-pistols/walther-cp88-177-nickel.html will be much better for the purpose.

If its for the Manuel of Arms and a bit of "Recoil" a GHK Glock with a steel slide kicks the hardest by far.
 
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