CZ SCORPION EVO 3 S1 9mm Pistol 7.72'' barrel threaded 1/2X28 w/SB Tactical SBT EVO Folding Arm Brace 6 mags Total - $929.99 (S/H $19.99 Firearms, $9.99 Accessories)

No it doesn't.
I bought this. I'm a little surprised with the sb brace. The way it fits to the adaptor is really poor. The rubber on the adaptor brace end gets stretched to fit

It would be 2 Day Priority / 2 Day Air since it's a pistol, requirement by USPS, UPS and FedEx.

Not cheap on a rather large package, I have dealt with one merchant on here that sent a pistol via ground cause the manufacturer uses a rifle size case, it was NOT Prepper.

My order from Preppers have always been FAST, order and have a shipping number the same day.

While the shipping cost might be higher, look at over all cost when you compare, no CC fees, price and shipping to come to a fair comparison. No I don't work for Prepper, I have purchased a few firearms from them in the past. So a returning customer, have to say they're tied for best customer service on here, Mag Commander being another outstanding merchant.

I don't know specifically if these new ones are welded, but the weld on mine took me about two minutes to drill out with a 5/16" carbide drill bit in my cordless drill. My screw was fine, if somehow your screw gets damaged you can order a replacement from CZ for $4.

I compared the new model with both 1/2" threads and 18x1 threads to the old model with just the 18x1 threads. Those 1/2" threads look tiny and short, and the 18x1 threads are shorter on the new model. I am fine with the Silencerco 18x1 adapter for my suppressor, the threads are bigger and therefor stronger than 1/2-28.