Well, I screwed up.  After cleaning my R9, I set aside all the cleaned parts when finished.  I then decided to take the towel I was using and proceed to take it outside and give it a good shake.  Yes, I don’t have a trigger pin anymore.  Apparently I’m not very observant.  I’ve had 5 other R9’s before this one and this is the first time I realized they are two separate parts.  Every time cleaning or disassembling my past R9’s, I would just slide the trigger out and not once did they ever come apart.  I’m pretty anal about cleaning my firearms and I cannot believe I never noticed this!
    Anyway, I was hoping someone could help me out on where I could purchase this part.  I’m assuming the pin has pretty specific dimensions.  If not, is there any other firearm parts available that could substitute?  Very embarrassing.  
Thank you and I hope you all have a Merry Christmas and happy New Year!  
Jim
(Lifetime firearm owner and 25 years Retired Military.  Never in my life have I misplaced/lost a firearm or part!!!!)
Again, very embarrassing, but I’m lost without my functioning little buddy.