My apologies on Dilli's post, yeah, I see that now.
I was sort of wondering as well if that one was cut or not.
I think this is the factory poly handguard (images pulled from the ACR media thread https://www.canadiangunnutz.com/foru...hread/page10):
I know there's a Magpul PTS handguard (long) out there that completely covers the gas block, but it was actually for Magpul's airsoft line: