Factory RC is a new company. They’re known for their “O-Slip” shock o-ring lubricant and most recently their 22-4 Shorty Brace for the TLR 22-4. They also distribute a few other products such as MoGrip which is the exclusive tire condition for the Outback Raceway in Chico, Ca.
My current favorite product is the 22-4 Shorty Brace. Having converted my own car to this configuration I personally hated messing with battery foams. The 3mm carbon fiber brace fits snugly and with the adjustable battery stop you can move the pack for and aft wherever you want, no need for foams.