M90 with jmac 4 c slim brake - JMac Customs 4C 14-1LH Slim 4-Port Muzzle Brake

I purchased a zastava M90 while ago. Nice rifle out of the box. I run 200 rounds with the slant brake that it came with. Recently I just looking at optics planet app and this pop up at really good price. Purchased it and took my m90 out to the range. I was hitting steal at 100 yards every single time with iron sights and standing position. Right after my first mag. Other shooter were coming over my table to ask with kind of ak variant wa that. It really was the jmac brake.