MattTheGunslinger
Ultimate Member
I just bought an FN upper with 20" hammer forged barrel to upgrade a pre-2013 rifle. I was going for a plain M16A2/A3 look. When I received the upper, I was a bit confused. It's a 20" government profile barrel...mostly. Forward of the FSB there is the M4 style grenade launcher cut out in the barrel. Why? The receiver has FN markings as does the barrel. So it's all FN stuff. Has this ever been a thing for military 20" barrels? It's a great looking upper. Fit and finish is excellent. I'm just kinda bummed they put an M4 cut on a 20" barrel. What gives?