What the others have said about purchasing a name brand gun, either NIB or used, is spot on.
You are naturally concerned with the gun firing should you ever need it however it's not the first shots from the gun that I'm focused on. It's the 5,000 round because it means I've trained with the first 4,999 shots, established my capabilities and I know the gun is durable and will be there if necessary.
Unless it's a fun gun, your focus should be on the long term use and reliability.
"Of every 100 men that go to battle 70 should not even be there, 20 are nothing but targets, 9 are true soldiers, and we are lucky to have them for they the battle make but ONE, one is a warrior, and HE will bring the others home." Hericlitus