Hey fellas. I picked up my ACR Enhanced last Friday (brand new for $1350 ) and I'm kind of interested in getting the basic handguard since it's fairly affordable and longer than the railed enhanced handguard. Are they M-Lok compatible? I'm assuming they're at least MOE compatible.

FYI, I'm loving this gun. I'm planning on getting a Form 1 filed here pretty quick and when it gets approved (sometime between now and when my unborn children graduate college) I'll get the 10.5" barrel for it

They are all moe comparable. I've not seen any mlok ones yet.  That being said, they won't be able to be suppressed with a 10.5" barrel unless you cut the front of the handguard off

I figured as much for suppressor use, but the basic handguard will likely only be in place while I'm waiting for a stamp. The enhanced handguard looks like a fine length on the SBR

The slots in the Basic handguard are MOE compatible. 

Also, check out the RPM Precision MLOK handguard. It's available in both sizes. 

^^THIS. Awesome handguard. Love mine. For M-lok, there's also the Nexus Tactical handguards.