The ASI/Gamo Center pistol is an underlever cocking pistol with a plastic plate/loading tap that flips out of the side. It is a better version of the Gamo Falcon (which apparently came later at a cheaper price) but has no safety catch. The Falcon (if my memory is correct) had a crappy plastic lever located by a small spring and a bb.
The Falcon also had a plastic frame which made it seem very crappy, almost like an RO72
The Center has a fairly decent die cast frame. You can also adjust the angle of the grips by undoing the screw on the underside of the pistol grip and swiveling the grip into place before tightening the screw again. The trigger is adjustable via the smaller of the 2 screws at the back of the trigger guard, although you have to undo the larger one a little first as it bears on a piece of spring steel that locks the smaller screw into place.
The example of the gun I have had a crude homemade rearsight and someone had fitted a .22 barrel and drilled to loading tap to suit.
Ok--here we go. Remove the rearsight if you want. To make things easier, undo the screw on the underside of the pistol grip and then remove the upper of the grip screws. This will enable you to remove all the pistol grip (for ease). The frame is fastened to the cylinder by 3 screws, one at the back and 2 at the front. Undo these and remove the frame.
You can knock out the cocking arm pivot pin and remove that if you want. If you want to remove the loading tap, the is a screw at the front of the breech block, next to the barrel. If you are doing a fullish strip down you may want to do this to change the breech seals or the O ring on the transfer port insert (More later). Put pressure on the endcap and remove the cylinder end pin and release pressure to remove the endcap/guide, mainspring and then piston. The piston washer is a leather one, with a plastic buffer, held on by a crosshead screw. With the guide,spring and piston out, if you shine a torch down the cylinder you will see the transfer port insert. If you wish to remove this (it has a small O ring on it to seal it) then you will have to undo the grubscrew at the front underside of the cylinder. This locates in a groove on the insert. With the screwout, you should be able to use a small rod or something to push it into the cylinder. The O ring that seals the breech will probably remain in place. There is also a seal on the barrel side as well if you want to change that.
Clean and lube your bits and go to pt2.
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