It is never a good idea to disable a factory safety. It would not be a good thing for a gunsmith to tell someone how to bypass certain built in safeties. There is a certain amount of risk in doing so from the stand point of a professional gunsmith.
However, in the interest of educating gun owners about the design and function of their weapons, I feel a discussion is in order to better help you the owner, appreciate the fine mechanics surrounding the Browning Hi Power pistol, and how they managed to screw, er, I mean, improve on the original design in order to promote safety.
So, from a purely innocent discussion of your weapons unusual and interesting design, let us continue.
Pull the slide. Look into the trigger well and look at all those little parts.
You will see the annoying, I mean, interesting magazine safety plunger protruding from the rear of the trigger into the magazine well. Notice also how the trigger lever sits on the right hand side of the trigger and how the trigger spring rides on the lever.
Take your finger and push in on the safety plunger and watch how nicely the trigger lever pivots. Notice also, how the trigger spring now lies on the cam surface of the trigger lever, when the lever is pushed forward in the proper position to fire the weapon.
This weapons trigger and sear are completely separate from one another and must rely on the sear lever which is located in the slide, to connect the two. This connection only occurs when the trigger lever is rotated into position by the Magazine safety plunger when a magazine in inserted.
Okay, You decide you wish to give the weapon a thorough cleaning by breaking the trigger assembly down into it's component parts. At this point you really need to pay attention to what you are doing or you may lose certain parts.
Okay, first remove the trigger pin, if I remember, from left to right. Notice how the trigger spring sits on the forward shelf and lies in the groove on the trigger lever to help keep the pin from walking.
By removing this pin, you should now be able to lower the trigger enought to remove the little pin at the rear of the trigger which holds the magazine safety plunger in place. You will need to lift the trigger lever (on the right hand side of the trigger) out of the way in order to remove and inspect the plunger and spring.
Oh shit. You dropped the plunger and spring??? It fell down the heat register? Well, you will have to make arrangements to get a replacement from your gunsmith. What? You need to use your weapon in the meantime? Well you're in luck. There just happens to be a way that you can temporarily use the weapon until your magazine safety parts arrive.
Reassemble everything in reverse order without of course the plunger, spring and pin. Re-insert the trigger lever. Now, look closely at the trigger lever. With your finger, move it into the position it would normally occupy if you hadn't lost the plunger and if the magazine were in place. Now, carefully bend the rear of the trigger spring to hold the trigger lever rearward, in this position. The lever will not stay in this position unless the spring is bent in such a fashion so as to physically hold it there.
Go ahead and reassemble the slide and check to make sure that the gun will work by cocking the hammer and pulling the trigger.
Be sure to reinstall the magazine safety stuff when they arrive so you and everyone around you will be safe...