I picked up a retro upper, slickside, A1 handguards, 3 prong that I want to convert into something more like a 605 (although it's getting an RRA Entry stock for now, maybe a 607 later if I can figure that out for a reasonable price).
It has an A2 profile barrel on it, which really doesn't match, and it's a Del-Ton 1/9 barrel so I don't have much use for it... so why not cut it down to 16.5" or so. Most of what I shoot is Wolf Gold, I'm not planning on shooting steel case through it. I haven't cut down a semiauto rifle barrel before, or threaded one, so I figure I should start with one I don't really care about - if I screw it up it isn't a huge loss.
How big should the gas port be to run reliably?
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