I have two stock Gen 1 Marauders, i got them, the 177 in june and the 22 sometime later in 2010. Both are extremely accurate. I just got a crony last week and the numbers for the 22, at 2800 psi, and only shooting 20 yards in the basement, were 20 shots in a dime size hole ( all the paper is gone) or slightly less than a dime, and the first shot using crosman premier 14.3 was 862, the highest 891 (12th shot) and the last shot #30 was 859, average 875, standard deviation was 9.
The barrel has never been cleaned, and i do lube the pellets.
I only target shoot so this gun doesn't need a regulator or anything else for my purpose.
I am sure it could be tweaked, but to what end for me.
Now the .177 likes less of a fill, extremely accurate, shooting the jsb 8. something pellets, it does seem to drop off more, i think because of the lower fill.
30 rounds, 2400 psi, first round 961 the 30th round 911, average 939, first round was the fastest.
I have cleaned this barrel one time.
These are not that exotic, but they are reasonably priced, reliable and accurate.
I think offering a regulated gun/option will appeal to those with more diverse use of the gun and Crosman is finally responding to this popular modification.