Does any company make a blank sleeve to use in place of the gas block.

[Goochylogic]

Looking to use a blank sleeve in place of the gas block to change from a semi-auto to a bolt/manual operated system. I have a conversation regarding the Kali-key ongoing. I?ve searched the net and have not seen a non functioning gas block or sleeve. Just wondering if anyone knows of a company makes such a device. Thanks Chuck