Started working on installing a floating firing pin in the pps 43 bolt yesterday. The fixed firing pin is replaceable and just retained by the extractor. Just compress the extract spring and the extractor should drop out and the firing pin will fall out of the front of the bolt.
The bottom of the hole is irregular as its split by the pocket for the extractor. I machined a piece of O-1 steel to .27 diam and pressed in the hole to support the bit , clamped the bolt in the 3 jaw chuck and then drilled the firing pin hole thru to the cross hole that the return sprin passes thru. Here is a pic
clamped the bolt in the milling vise with the rear of bolt upward then drilled a hole thru to the return spring pocket. I now have a bolt with a 5/32 hole thru it lengthwise, not really sure whats next. Thinking I might cut the rear 1.5" of the bolt off and use it as a striker. any thoughts greatly appreciated