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To add on what WRMETTLER stated, check the bolt carrier key to make sure it's not too plugged up with carbon or other debris. I've done some research the past few days on this, and build-up seems to be a primary cause from what I gather. Also, check the key/tube alignment by field stripping the bolt carrier group, then inserting it into the rifle, hold at a 45 degree angle, move the carrier flush to the rear of the upper receiver, and let it drop (charging handle latched of course). It should be a smooth operation. If binding occurs after cleaning, it could be barrel nut alignment, bent gas tube, or bent carrier key. Just another possibilty. Back in my lane. Out.
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