In the back of the gat there is silver button just before the back of gun. push this through right to left (when the gun i facing barrel away from you). when you have take this out the bolt, ram and stuff will come out. Make sure this is clean a free from black residue, then lube the bolt and the hammer o-ring (the o-ring under the bolt at the front of the ram. part 46 in the manual).
Before you fire the gun take a 0.50 hex key and screw the recock screw all the way in (clock wise to put it in, part 10 in manual). This sets the recock to as low as it can go.
when you gas the marker up set the pressure of the vert reg to 180-200psi then slowly screw out the the recock screw (about a quarter turn at a time) do this until the cocking rod at the back will recock without you having to pull it back. this allows the gun to use its own pressure to recock. You have to set the recock everytime you gas the gun up but its very quick and easy to do.
To clean the cam arms and the breach take the right side of the gun off with the feedneck and clean as needed, make sure there are no bits of broken shell in the cam arms on the rare occasion you get a break.
+ if its is an omen 1.1 make sure you dont use a force fed loader like a halo B or q-loader, use an egg. You can solve this problem by getting a set of 1.5 cam arms.
I wrote this in a rush so will be back on tomorow to edit how crap it is. If you have any question just post up or pm me an i'll try an help.
bob
+ this is the link to the manual if you need it
http://www.evil-paintball.com/omenmanual2.pdf