Ok so I built a Ar9 using a new frontier lower and new frontier side charging upper with hold open. It has about a 4.5 inch barrel with a griffin armament rev 45. Ive had it for almost a year. When i first built it, it would break bolt catches all the time. I put a heavier buffer and a spacer. I stoped having catches break or so I thought. I shot about a thousand rounds without a single issue until last week I had a catch break. So i replaced it and shot it for the first time today and it broke the catch within the first mag... So the question is what else can I try to stop breaking the catches. part of me is think about just putting a regular upper on it without the hold open.
