Aren’t most gun sellers required to do background checks?
Not on individual sales in state. What should be looked at is everything hidden in the edict. Will they regulate ammo sales? Will they regulate mags and accessories? Will they drive up the prices?
It depends upon state law. In Idaho, I can do a private purchase or sale without involving an FFL. In CA, a transfer between two private individuals requires an FFL to record the transfer including background checks and fees. CA gives LEOs a pass (as with most CA gun legislation). Some states require a Firearm Owner ID with lots of extra paperwork and FFL/local LEO involvement.
I have purchased from FFLs in WA and KY via GunBroker and Buds. You pay for the firearm, shipping and insurance to deliver your purchase to an FFL near your home. The local FFL exchanges license information with Buds or GunBroker before the firearm is shipped. When it arrives, you go to the local FFL, fill out the Form 4473. They run a background check (not required for me as they simply record my CCW info on the 4473). If the background check passes, the local FFL records the sale in their bound book and collects a service fee for doing the receipt, paperwork and background check. My local FFL charges $18 per FFL transfer. If I purchase more than 1 from a single FFL, the multiples go on the same 4473 and only on fee is assessed.
There is no "internet" loophole when purchasing from an FFL on the internet. You still have to abide by your local state laws. The background checks are done. The Form 4473 data is collected and recorded. No different from purchasing an item on display at the local FFL shop.