I decided to carry out some comparative accuracy tests.
I won't pretend these were very scientfic, but they are a REASONABLE reflection of the kind of accuracy that the average shooter could expect to achieve with these guns.
I tried to keep all the tests consistent in terms of distance, target type, grip used, number of rounds and type of ammunition, at least between weapon types.
Basically, all shooting was carried out indoors at a range of approximately 18 feet (5 meters), against an A4 silhouette target (about 1/3 size, I guess), firing 6 rounds. I used a double handed grip in all cases and I'm left handed.
Tests of Non-Hop-Up Springers and Hop-Up Springers - See the results here.
DumboRAT's tests of a wide selection of NBB and GBB pistols - See the results here.
SOCAL Airsoft's tests using a longer range and different targets, but interesting nonetheless - - See the results here.
My NBB Gas gun tests - See the results here.
My GBB tests - See the results here.
My Full-auto gas handgun tests - See the results here.