Yesterday was the first opportunity I had to put in significant trigger time with my CMMG 5 inch banshee since I have had my CGS mod9. It’s shot fine, perfectly reliable and was a dream with 150gr syntech however on several occasions I noticed a fairly substantial flash from my ejection port. What gives? Heavier buffer necessary? Like I said it’s shot great so I am hesitant to start tinkering but if it is some thing as simple as a buffer swap I would consider experimenting. PFA