I just figured out that P88 magazines will work in your p99. It feeds normally. slide locks back on the last round etc.
Have not tried it on the range yet. I just thought you might like to know.
Also I found some High Cap mags for a Vector 9mm. It is pretty much a knock off of a beretta 92F magazine. They are very well made. With just a slight dremel adjustment they can be made to work in either a p99 or a P88. They have a enlarged base plate that allows them to hold 19 rounds. They fit really nice in a P88 and hang out the bottom of a P99.
Have not tried it on the range yet. I just thought you might like to know.
Also I found some High Cap mags for a Vector 9mm. It is pretty much a knock off of a beretta 92F magazine. They are very well made. With just a slight dremel adjustment they can be made to work in either a p99 or a P88. They have a enlarged base plate that allows them to hold 19 rounds. They fit really nice in a P88 and hang out the bottom of a P99.