First off, just posting to educate myself and this is in no way a defect or a poor performance thread. I noticed a much larger flash on my BCM 16” upper (recent purchase) with a mod 0 compared to a 14.5” BCM upper (2013 purchase) with a pinned mod 1 comp. Using the same exact rounds that I hand loaded with H335, flash is very similar with American eagle and pmc xtac 5.56, all 55gr ball. I have images from slow motion video, need to find a hosting site. For now imagine a 1 inch flash vs. a 10 inch flash diameter.
Do the longer ports in the mod 1 make flash suppression that much better? The recoil difference from an A2 is great, very happy with that performance there. I’ll admit I am a BCM fanboy so hoping to get some insights here, might try a Mod 1 on the 16” for testing