Much better than roll pin, of installed correctly - KNS Precision Bolt Catch Retaining Pin for the AR15/M16 w/3 C-Clip Retainers

I jave used these on 3 builds. The main thing is to ensure that u install the E clips correctly & that it isnt bent. If u dont get a positive "snap" when clip is installed then it is either bent or not secured properly. It comes with 3 clips so just if u dint get it right the 1st time l, just put the next one on ensuring u get that positive snap feel/sound. As long as u do that it will stay in place without any issues. I love using these.