the physical effect isn't much different than just preloading a single stage trigger by the same amount.
It is different. A lot different.
I don't know how to explain, but when you take a 4.5lb trip over a sear, it's a lot different that taking a 2.5lb trip over a sear. The 1st stage isn't moving sear engagement. All the movement of a single stage is moving sear engagement.
