I would change out the buffer and spring. The spring is short on coil count if it is a standard carbine buffer spring and the buffer looks to be one of the gold colored ones out of a Chinese stock. Also might want to check the depth of the stock tube. There were some out that were not deep enough. Should be close to 7" deep.
Also I would check the front carrier key screw to see if it was broken and leaking gas when it is fired. Never hurts to clean the chamber well also
I would not try any type of heavy anything spring or buffer if the gun is short stroking.


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