"Original 1911A1 GI Specification"
I agree with GC70 that the Tisas is pretty close to the M1911A1 specification. For the few who may not be aware, the pistol originally had a different designation and a different configuration. The most obvious differences are the flat mainspring housing and medium-length trigger in the original as compared to the arched mainspring housing and short trigger in the M1911A1. There are also some other differences. Below is a photo of my Colt Anniversary Model which is a very close reproduction of the original.
I agree with GC70 that the Tisas is pretty close to the M1911A1 specification. For the few who may not be aware, the pistol originally had a different designation and a different configuration. The most obvious differences are the flat mainspring housing and medium-length trigger in the original as compared to the arched mainspring housing and short trigger in the M1911A1. There are also some other differences. Below is a photo of my Colt Anniversary Model which is a very close reproduction of the original.