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Interesting, so the barrel is heavy profile to the 'A' sight/ gas block and then reverts to standard profile.

Would I be right in saying (from dimming memory) that the A2 HBAR had a heavy profile...

I would think the triangular guards would look slightly odd on the heavier profile A2/A4 barrel. I assume the A1 handguards will fit as is, or do you need to swap out the delta ring and front collar?