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Message: <blockquote data-quote="n8thegr8" data-source="post: 2581004" data-attributes="member: 6349">The gunsmithing section on akfiles.net is probably your best resource (beware the general discussion, lots of crazies in there, even by OSA standards, lol).The trickiest part is getting the barrel and all its components lined up and pinned. I riveted in the trunnion before messing with the barrel, so I headspaced the barrel and pinned it, then pressed on the rest of the components and aligned them. Some people do all the components first, then press on the assembly. Some people headspace the barrel to the trunnion before riveting it, then remove it and reinstall after riveting. I think the way I did it is by far the easiest.Press on the RSB aligned with the ears on top of the trunnion, and until you have a good fit with the dust cover.Press on the Gas Block until you get a snug fit with the gas tube, check the gas path with a piece of copper wire to make sure it goes into the bore.you can tie a piece of string to one of the stock holes in the rear trunnion, and run it to the front site to check alignment, and using an angle finder helps A LOT.Take your time, go slow, and check everything along the way over and over again. It's really easy to get carried away and mess something up (Bending a barrel and cutting into the trunnion in my case, lol). Use plenty of cutting oil when cutting the channels and anti-seize on the press fit components.</blockquote>