Anyone ever have issues installing a Geissele SDE in a POF 308 rifle? I have installed 6 Geissele triggers in other AR's but I cannot get the hammer pin in on this rifle. It keeps wanting to push upward before it reaches the far hole in the receiver? I have removed the trigger and then I can get the hammer and pin in straight but not both at the same time. It appears the trigger does not have as much movement as my other AR's and I noticed how much thicker the bottom of the receiver is where the trigger drops through. Will this particular trigger not work with POF 308's or is there a problem with the rifle or maybe the installer?