Show the back of the barrel sometimes when clipping out the ars a bump of plastic will pop up just sand it down till it is flat
I thought that might have been the problem, but it continued even after I filed everything flat.
Are you sure that the running bar is interacting with the turret fully?
Thanks for all these pictures, rarely a noob has as good post quality as this.
It looks like the bar is going where it should be, and comparing it to another one I couldn't see any significant difference. I did notice that it seems to happen when I don't prime the blaster fast enough; it rotates fine when I prime it very quickly, but doesn't travel all the way if I don't (which is relatively common due to the nature of the priming mechanism).