detail stripping of P99 lower
No big deal, provided you got the proper tools ! (i.e. a small hydraulic press and a multitool like a leatherman).
I completely stripped my P99 in order to get the locking block replaced by a new one and consequently a profound cleaning of the gun. You have to consider three major things :
1. the assembly of the P99 lower is kind of modular, for example the trigger unit and firing control unit (located at the rear to release the striker) consist of different parts but make one unit which can be removed as a whole by pressing out the corresponding roll pin.
2. the tricky part is to remove the take down latch without screwing things up. Be carefull and gently press the upper part of the latch outwards by means of a smal screwdriver until it snaps free from the retaining pin, after which you can lower it and twist it to remove it.
3. it's recommended not to use a hammer to drift out the roll pins but to use a hydraulic press instead (I know, I'm lucky enough to have one from where I work). I completely wrapped the gun with thin cardboard layers and tape in order not to scratch the frame during the (dis-)assembly.
Finally, keep cool and if things are not going as smooth as expected, take a break and start again afterwards. It's not worth hurrying things and risking a scratch or damaging a nice tool as is the P99.
Although I would not recommend to completely dismantle the P99 on a regular schedule, there might be a need for it, for example in my case where I had to replace the worn block or when you consider profound cleaning (every three or four years ?)
If you need more info, please advise. Good luck