Tom: I found this reference in one of the late Ian Hogg's books:
To dismantle the Borchardt first ensure that the magazine is removed, the gun empty and the striker forward.
Then grasp the recoil spring housing securely, remove the screw therein and then allow the housing to come away from the pistol (under control, since the recoil spring is tending to force it off). Pull the housing clear and unhook the recoil spring from its anchorage on the toggle.
Do not attempt to remove the recoil spring from the housing. The side covers on the frame may now be lifted clear to expose the toggle anchor pin, which can then be pushed out. (It may be said at this point that familiarity with stripping the Luger is an asset when dealing with the Borchardt.)
Next remove the screw above the trigger and push up the trigger plate and trigger to remove them.
The barrel unit with the toggle can now be slid forward on the frame and removed, and the toggle and breech block can be taken from the barrel assembly by sliding them rearwards.
The breech block is closed at the rear by a screw-head; give this half a turn and it, together with the firing pin and firing-pin spring, can be removed.
Reassembly is the reverse of the above procedure, but care should be taken when hooking the recoil spring on to the toggle and replacing the recoil spring housing in position.
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