I use soldering for durability. If you make metal parts plastered with epoxy putties, then during molding into rubber for centrifugal casting, under pressure and temperature, there is a high probability of breakage of the master model. In addition, the strength of the model is needed for its safe delivery by mail. However, I do not always use soldering, sometimes it is enough to replace it with a 10-minute epoxy glue (as in the photo below, where the gray color is Poxipol glue).That's right - the quality is quite enough. Once upon a time I also used soldering - but for what?
The fact is, Comrade Sergey, that the price offered for our work by our customers does not correspond at all to your labor costs. Moreover, all these weapons are now stamped in 3D technology. But there is one "But". 3 D is not able to portray a truly charismatic character. Therefore, personally, I don't care about the quality of weapons made by hand - I'd rather use my artist skills to create an image of an interesting hero. And no 3D can beat me in this.