I am ashamed to say only 1..........
I am sure the NFA dealers are not happy about having to keep the items in their possession for a 6 to 8 month period after the customer has paid for it. Quite frankly, I think I am off of the form 4 wagon for a while due to the waits.... At least with a form 1 for an SBR, you can shoot the item in a non NFA configuration, until your stamp comes in. for my AR, can use it now with a 16 inch barrel , and when the form 1 is approved, then I can buy a shorty upper, and just slap it on...