it looks pretty much stock other than the bolt and barrel. its definately a pre-2k, the blocky milling is the giveaway.
main reg is adjustable, but you have to take the fitting off the bottom to do it. they are solid regs though, will handle co2 like nobodies business.
it has a 2k+ spec back block, looks like one from a prostock or something, so even though its a pre 2k cocker it will take 2k+ spec bolts. that was one of the only major differences between the two, pre-2ks had a longer back block and bolt, and a smaller banjo bolt to hold the front block on.
come visit us in the cocker sections, well take care of you there. also check out www.customcockers.com
. lots of guides there on how they work and stuff. theres a lot you can adjust on one, and they can be a headache at times, but once you understand how they work its a breeze. as for regular maintenace, its easy. all they need is a good wipe down after play and just put some oil right into the asa every few cases and dry fire it a few times. they are definately some of the best mechanical guns you can buy.