I am a pretty new member, and only joined this sight because I wanted to bash a weapon manufacturer. I have since ate my words about that company and they have made the problem right. Anyway, I am looking to trade my Olympic Arms 16 inch bull barrel upper with 4-16X scope for a flattop m4 upper. I was hoping someone may be able to point me in the right direction. If you know someone that may want to make that trade let me know with a pm or email me at email@example.com Thanks guys and gals.