I need to find out all the info on tcr's QUICK as possible..

I need to know how to tell the difference between tcr83 and the tcr87 ????

I know some of the tcr87 have a mag stamp. but I hear some 87's are mag but not stamped..

were there any Double set trigger models made in a tcr87 with a mag stamp or are they just factory converted tcr83's..

Did the serial number on the tcr83 and 87 run strait throw and dose any body have a time line what was made??