If it matters, the rifle has a 16” government profile barrel with “carbine” length gas system, and standard weight buffer and spring.
A 16" barrel with a carbine length gas system will almost always be over-gassed. The rifle will be extracting the fired brass even while the round is still in the barrel and pressure is still very high, leading to violent ejection, sharp recoil, and chewed-up brass. This is why mid-length gas systems are becoming more popular in 16" barrels.
That said, an easy way to fix your problem is to install a heavy buffer. I'd recommend at least an H3 buffer, but anything heavier than your standard-weight buffer will be an improvement.