Sorry, I had no intentions of making anyone feel stupid.... I was really trying to be sure which M87 you were talking about.
The McMillan M87 actually beat out the Barrett M82A1 in the trials that the US Army conducted, but because of the amount of M82A1's that were already in service, they decided to go with them (my understanding is this was contrary to all the sniper folk recommendations). McMillan no longer makes the M87 that I am aware of, they have switched to the TAC-50. I may be mistaken on that, it might be available if you ask them.