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A question I have to pose is the following: Upgrading from a 455mm barrel to a 590mm barrel (tightbore or not) would require a boreup kit right? (I've heard some using no boreup kits, but they don't get that good preformance).
Now due to MAA rules LMG's must be under 350 fps, and since I'm building this RPK for that exact reason... Will a boreup kit (HurricanE /w bearings) function properly under say, a stock CA AUG spring (settled at 315 fps), plus bearing spring guide and a 6.04 BS barrel?
PS. What does the N-B on those N-B type cylinders mean anyhow?
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