FX Impact M4 rear stock holes - Will MLOK accessories fit?

Hi,

Just wondering if anyone tried to see if any MLOK accessories will fit the rear stock of an Impact M4? I don't have any so I can't try for myself. See picture below. I know Saber tactical had an attachment for the M3 which isn't compatible with the M4. My only guess would be the M4 metal thickness is too thick for the MLOK to fit... maybe the length of the hole is too short too. The reason why I'm asking is I'm trying to figure out a way to mount a sling. The only way so far is to thread the sling from one hole and out the other. It is functional but not pretty...

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