Front Sight Post Size Help Please

AR/M4 AR Technical Discussion
1

Bought a 14.5 upper with FSB minus front post from Numerich a while back. Can’t remember where I bought the fsp kit …but post wiil not thread into base…too large. Just assumed base and post threads would be universal. I have searched and can’t find any info. Advice?

2

Two questions:

  1. Can you provide a link to exactly what you bought?

  2. Have you contacted the place you bought it from to see what they recommend?

3

Is the barrel marked BMP? Where did you get the front sight?