So today I actually went to test fire my AR pistol and shattered my gas block. I have built 12 AR's and have 2 more under construction right now. I meticulous when it comes to how i align and secure my gas blocks.i would like to think it was a defect! So I put 60 rounds of 55 grain just fine zeroing my red dot. I put in the last mag and saw a nice flame shoot out and nothing ejected. I heard some rattling in my quad rail and saw 3 pieces of what used to be my gas block. Has any one seen this. Unfortunately I can't remember what brand it was. Here is a pic of what I got to fall out. I have to strip her back done and start again. epic fail !!!