No person in this state may manufacture, import, distribute, sell, or offer for sale any assault weapon, except as authorized in this section.
And the law includes the following as one of the definitions of an assault weapon:

A conversion kit, part, or combination of parts, from which an assault weapon can be assembled or from which a firearm can be converted into an assault weapon if those parts are in the possession or under the control of the same person;
One of the defining features of an AW is a "shroud", so a common interpretation of this includes a restriction on buying handguards.

Knowing the above in advance, I bought the CMT 15" ARCA rail as one of my pre-ban panic buys and have it mounted up on my 20" RA Ultra Match so I'll post up some photos / thoughts in a few weeks after i get some time behind it. Initial impressions are very positive. Machining is great, anodizing is very dark black. The mounting system is fantastic - it's similar to BCM or SLR where two cross bolts capture the barrel nut with no need to time the barrel nut and nothing is threaded into the barrel nut. This is what I expect from handguard design these days and just won't buy anything that requires timing or threaded screws in the barrel nut. The ARCA feels a bit odd in the hand (e.g., unsupported), but obviously it's for a rifle that is primarily shot supported and off a bipod or tripod. The only minor complaint so far is the dog ears that wrap around the upper receiver to prevent rotation are a little too tight and I should have file one down a tiny bit to ensure the top rail is in perfect alignment. I didn't so I have a tiny ridge on the rail that might prevent a railed accessory from sliding over the transition without binding. I couldn't think of a time where that would actually be a problem so I left it as is. It's very tiny so you don't see it unless you are really looking for it. I have a Harris bipod on an ARCA adapter for my precision bolt gun I'll use on this. More to come.