IIRC:
An original M16A1 barrel is .600" under the handguard, .625" at the gas block, and .575" in front of the block.
That being said, let me guess before you post up any answers.
Adding extra meat for the Grendel, it could probably be plenty safe at .650" under the hanguard, still .625" at the gas block, and .600" in front of the gas block. People would freak out, but it'd likely still be safe even thinner than that.
How close am I?
ETA: I'd also bet that in a 12.5" barrel w/carbine gas length it'd still be stiff enough for general purpose use.
An original M16A1 barrel is .600" under the handguard, .625" at the gas block, and .575" in front of the block.
That being said, let me guess before you post up any answers.
Adding extra meat for the Grendel, it could probably be plenty safe at .650" under the hanguard, still .625" at the gas block, and .600" in front of the gas block. People would freak out, but it'd likely still be safe even thinner than that.
How close am I?
ETA: I'd also bet that in a 12.5" barrel w/carbine gas length it'd still be stiff enough for general purpose use.
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