Tungsten is significantly heavier than steel. And not as strong. Something doesn’t seem to add up.
You are correct. Titanium pins.
That’d do it. Thanks. 
It’s been decades since I had a 1911-style pistol. But I was never too concerned about a muzzle-down drop. After all, where is the barrel pointed when it fires? It’s the muzzle sorta upward drops that shoot people. Whether the gun handler themselves or bystanders.
Accidental discharges are always a bad thing. But some are badder than others.