Thats what he did, interesting project and very cost friendly from go.
I have a few MI drop in rails. YHM FF, Troy, samson etc. Not really a full quad rail guy, however if you act quickly when posted for sale ,used has been very wallet friendly for me. I scored a YHM quad carbine, ball milled the top and installed on my AA SBR for less than 1/3 the price of new.
The Great Kazoo's Feedback
"when you're happy you enjoy the melody but, when you're broken you understand the lyrics".
I had one of those too. It went on easy and had zero movement once installed. Good deal for the money. My only complaint about it was that it was a bit fat, especially with rail covers. Going used is definitely a good way to get a decent handguard on a tight budget. Lots of people buy one and then change their mind and buy something else.
Here is one of the Midwest Industries drop-in units.
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That free float handguard tube was originally for a full length handguard. They don't make one for a mid length. I had to modify it by shortening and rewelding.
Those free float tubes are for service rifle competitions since the rifle has to appear stock. The stock handguards go over it.
Just thought I would show you another option since most assume a free float is a quad rail type.