This is why you get an Aero Precision M4E1 lower receiver. Built in large trigger guard and threaded bolt catch, you just screw it in and out with an Allen wrench. No roll pins used at all! I'll never go back to regular lowers lol.
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Looks like one more thing to strip out, come loose, or generally difficult to find a replacement for (non standard part for an AR). I like Aero's threaded design, but other than what we saw in this thread a roll pin is foolproof.