The BTA90 is a compact version of a CZ75 Clone.
Toward the rear of the slide you'll see a vertical line stamped in the slide. draw the slide back about 1/4" and match that line up with a corresponding line stamped on the rear of the frame.
With those lines matched up, you can now push the slide stop out of the gun. Push on the opposite side of the gun and expect quite a bit of resistance. The slide stop is held in under spring pressure and often takes a lot of pressure to push out.
Once you have the slide stop out, you can now draw the slide off the front of the gun. Lay the slide down on a bench resting on the sights. Pull back on the spring guide where it mates with the bottom barrel lugs. Pull back and up and the spring will come free. Now, in one motion lift up on the bottom of the barrel extension where the slide stop goes through (called the barrel cam), and slide back a bit and then foreward, up and out of the slide.
Your gun is now field stripped and no further stripping is necessary for normal maintenance. Do everything in reverse to re-assemble your pistol...Enjoy
