Real nice prop so far, it's really smooth and indistinguishable from the highpoly for the most part. The most obvious part is the trigger area, it looks like it has less sides then the round thing+tubes just above it. Just a few cuts here would really improve the model a lot.
Nice, I have a buddy who is planning on doing another weta gun, it's a great source for reference. On the low poly the main rounded segment and the bulb parts seem like they might be a little dense. I think you could go in and collapse every other vertical edge (especially near the focal points and you wouldn't notice much…