I'm saying that it may be too heavy, or returning too hard. It can be overgassed, or too much weight in the bcg. In all ar style rifles, when a round is cycled, the round in the chamber will have it's primer tapped by the firing pin when the bcg slams forward. If you don't believe me, sample any other ar you have. Military primers are designed for this, and are harder, so it won't detonate them. You don't have to use military primers, but if you don't, you can't have the bolt return to battery with too much energy, or you'll get what you're getting.
risearmament.com
This is what I was thinking. The only time I've ever had a second one go off was due to this while shooting off bags or a lead sled.
CMC triggers uses zero set screws. They use antirotational screws for the pins.I had that happen to my Rise Armament trigger. The set screws had worked their way out.
Scroll down to "tighten the set screws:
Trigger Install
RISE Trigger Install A Step-by-Step Guide on How to Install a Drop-In AR Trigger You have your new RISE Armament RA-535 Advanced-Performance AR Trigger —
Bingo, bad trigger. You can't be expected to pull a trigger perfectly every time for it to not double. If it doubles, it's defective unless you're trying to bump fire or something like that. My Benelli Monte from the 90's is doubling sometimes now, it needs to go back which stinks they can't just send me a new trigger group.
Don't send it to beretta USA for warranty work. They literally stole the last rifle i sent them. They've had it for 5 years this month. Refuse to speak to me. Go to the BBB site where you will find that they have an F rating. Read the stories and you'll find out that they do this all the time. Better to pay a gunsmith for the repair than gamble with your gun. I don't buy anything they sell anymore. Before you ask, I've tried everything, even called a few lawyers, and there's nothing anyone can do.
