I have never seen this part break before.
I noticed the safety on my gun I use for most training felt a bit odd the other day. It still functioned but was very gritty and hard to work.
Tonight I had the time so I took it out and inspected it. Besides a lot of wear there was nothing obviously wrong with it. However as I was reassembling it I noticed this:
http://web.me.com/kwelz/Pictures/brokepin.jpg
I can honestly say I have never seen one of these break before. And of course the I went through my replacement parts and I have at least 2 or 3 extra of everything except these. Of which I of course have none.
What could cause damage like this. The gun has been through about a half dozen classes but for the life of me I can not think of what could cause this to happen. Maybe we need to start MPI testing the pins. :p
I am not going to say who the part is from till I have contacted them. However I will say that it is a HIGHLY respected brand by this board and myself. I have no doubt they will take care of it if I ask them too.