After some perusing...
Shooter's Element:
Charging handle (if staying with the polymer handguard) It just looks the best. Their flat trigger is also the most attractive choice for a traditional choice. Their trigger work option is the best bang for your buck trigger work being done, probably almost anywhere. Not just including Scorpions. $50 for a pro to throw the kitchen sink at a trigger and drop up to eight pounds... with the little extra's too. It's unheard of. They are involved in the market and they care.
HBI: Handguards. Customer service. Poly charging handles if you do an aluminum HG. Lots of trigger options, charging handles, and other stuff to choose from. They are fully embedded in the Scorpion market and make great stuff.
Gear Head Works: Mag release. It's the right redesign in my opinion. Just enough extra tab, not to much to catch on things. The infamous tailhook / folding kit. Literally the best folding brace option for the Scorpion bar none. It is good looking and fully functional. Absolute game changer for the brace market.
PMM: QD sockets are expertly crafted to fit at specific points at certain angles to get you exactly what you want. I had some issues with their safeties on fitment, and they zipped new ones out without receiving the old ones back yet. I picked the best fitting of the ones sent, and sent the rest back. A company that steps up when things do not go well deserves recognition. I think their design is the best, the generational changes in the Scorpion was the issue with fitment. (If you have an issue though, they will take them back.)
Yeti Wurks: Man this guy ships fast, and his customer alert on products email system is on point. The mag carrier is well made. And I actually bought the tail hook kit from him with his adapter. He must ship same day because stuff gets here from him fast fast fast.
Manticore: Magazines. They build them better and cover your butt if something doesn't go right. Their handguard doesn't "look" as matchy as the HBI, but it is versatile with their panel system. They are a player in the AK market with an excellent track record.
I chose and am happy with the Apex grip as well. I like AK grips, so if you like AK grips. Buy the Apex, and just don't install the grip tape if you don't like it. I bought rubber grip tape instead of the sand and I plan on tracing the ones they provided and making rubber ones instead.
Other weird items I don't normally advocate is the nightstrike AFG. The diamondback specifically. I'm a stubby VFG proponent but if you are staying pistol this is the best thing going. If you trim the factory handstop you can cram all it on the rail and still break the gun down. *Order it
not from them if you can help it. Nearly a month and multiple phone calls to get my grip shipped from them. I got it but...