Before I send it back !

I recently purchased a RRA 2 Stage Trigger for my AR and the pins are kind of snug. Joe Bob outfitters has a deal on these for 99.00 and free shipping ! So I pulled the trigger and bought one. After a little stress getting the old trigger out. I placed one of the pins in and it would not go in. That is to say I did not force it in as I know there is different pin sizes. The receiver is an Eagle Arms by Armalite . Does anyone knows if it is Mil-Spec or one of those Colt small pin job receivers ? The RRA pins are "miking" at 0.155 and the old pins are miking at 0.152 . Before I send it back or Force it in anybody do one on a Eagle Receiver ?