Did you check how the operating slide moved to see if it was hanging up. Easy to check with the carbine barreled action out of the stock and work the slide and bolt, watch if it is hanging up on the receiver sides. i had trouble with one that had some dings in the slide rails and filed them smooth and problem went away.
When the people fear the government, there is tyranny. When the government fears the people, there is liberty. America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves