Now to check tutorials for barrel mounting. Any recommendations ?
The job can be done without a jig. As with any precision job, 99% of the work is in the setup. It helps to have knowledge of proper machine shop practice and tools.
• The position of the barrel relative to the receiver is critical. The barrel with front sight gives you lots of measurement points, use them. Devise a plan for reference measurements between the 2 parts BEFORE you start.
• Stop 1/8" in, and re-check all your alignment measurements.
• Research proper "press fits" for that diameter range. Polish the receiver well to bring the 2 parts into spec.
• Use a lubricant.
• Use a hydraulic press, not a hammer. Protect the barrel threads with something disposable. Weld on the permanent suppressor later.
• Recognize early-on that the final barrel position sets the "head space". Buy a head space tool.
• Work with this truth in mind: There is one chance for correct assy. Once assembled, there's no going back; no adjustment; no second chance.