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weaver, That looks like what is commonly called a chamber flag. The idea is that it prevents ammunition from going in to the chamber and at the same time it's easy for others to see. Except for the case head part which is brass, it's plastic. There's no way that one of them damaged the chamber. As has been pointed out, y'all have a rifle with a bad chamber. The defense of a nuclear power plant is a critical operation. Y'all need to find that rifle and have the barrel replaced. The cause of the chamber damage needs to be ascertained in order to know whether all the rifles need to be inspected.

BTW, Calling that chamber flag a breechblock is only going to confuse people. A breecblock is the block in breech-loading firearms that closes the rear of the barrel against the force of the charge and prevents gases from escaping. Some people mistakenly call an ejection port a breech. While it's not technically correct, it usually don't lead to confusion. In this case, it has because "breech" has been combined with a device designed to "block" it. Those words when put together in this case have an entirely different meaning. Call it a chamber flag.
Breechblock - Wikipedia
 
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