Blusqualo wrote:
When I fired the last round on an empty mag it locked back, but not all the way; it locked about 3/4" forward of all the way back.
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this indicates ones of two likelyhoods - gas port is too small, or gas block alignment blocking the port.
pull the gas block, and look at the carbon ring around the gas port.
if it looks like this - you didnt have an alignment issue
if the carbon ring intersects the gas port - even a little bit, you probably have an alignment issue.
now is also a godo time to verify that the gas tube/block is not blocked, give it a good cleaning just in case and verify you have good airflow
also check for leakage around hte gas block - you'll again have carbon stains around it that will look similar to this
I took pictures, but i can't seem to get them to upload, it says they are too large to attach
its easiest if you upload them to a 3rd party website like photobucket and use the image sharing link with the [ img ] tags on it