Quoted: I have never removed the handguards...don't have one of those special tools, but probably ought to invest in one. It has a detachable (A4?) carry handle.
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Just in case you want to try to identify the barrel and it doesn't have the markings between the front sight post and the muzzle, then you want to look under the hand guards to try and find what your looking for... You will need to pull back the spring loaded Delta Ring assembly to remove the hand guards. This can be done without a tool by one person, but more easily done by two people (one person to pull the ring back and the other to remove the HG's...
If there are no markings to be found, then I would say it is what I call a "Gun Show Barrel"...
The flat top receivers are usually marked on the side, just below the rail, or on the front, just above the gas tube hole...