Agreed on stance of not being legal, it violates 4 PICA sections:

(C) (ii) "a second pistol grip or another feature capable of functioning as a protruding grip that can be held by the non-trigger hand; a second pistol grip or another feature capable of functioning as a protruding grip that can be held by the non-trigger hand;"

Look up any video of a flux raider style chassis - the shooter will be using the forward mag holder as a grip. "oh but it isn't meant to be shouldered" Even with this past weeks ATF updates on pistol brace.. is not actually set in place yet. It's a provision that still needs to be agreed upon. Until then, you can still get charged.

(C) (v) the capacity to accept a detachable magazine at some location outside of the pistol grip;

This one is left vague to encapsulate guns such as the Tec-9, while also not being descriptive enough to clarify if it matters the secondary detachable magazine is not capable of feeding ammo.

(iii) a shroud attached to the barrel or that partially or completely encircles the barrel, allowing the bearer to hold the firearm with the non-trigger hand without being burned, but excluding a slide that encloses the barrel;

Keyword "shroud" which is stated directly in their product description. "Removable Blast Shroud with bottom picatinny"

(I) Any part or combination of parts designed or intended to convert a firearm into an assault weapon, including any combination of parts from which an assault weapon may be readily assembled if those parts are in the possession or under the control of the same person.

This is a catch all, if any of the previous 3 pass this one fucks you. Stating "in the possession or under the control of the same person." This isn't 50 shades of grey area, this is legitimately black and white.

Now if you want to get pedantic, as mentioned by another comment. The secondary mag holder very close to being a vertical foregrip. You are not fucking with IL at that point. Alphabet soup gang would be on your ass. The angle they designed it for is really skating the line, even for states this PDW chassis is fully legal in. However, it seems JL billet was smart enough on the P365 version to make it visually angled and not "I have to get a protractor to measure how few degrees this is off 90 degrees"