My search continues for someone that can replicate this part. The fastest way and easiest is to do it on a real gun. Contact directly COLT and have it done.
But as a collector I really would love them to have them softair. So I will remain on the idea that with some help from some one that speaks Japanese I can contact once again Marui and have it build as I want it.
I will continue the experiments on the these 2 models I have now. Mostly because I really need to find some one very capable in making those markings. It will be a nightmare to have ruined the slide with wrong positioned engravings.
I will start to save some money just for this. So far I have the right projects at least.
I plan to have made the slide just like this. The bar and the rear sight will be attached by me and produced by some one else. I have the perfect idea how the rear sight should hold. If you look at this picture you can see that the rear sight is just attached to the bar