Firefly and Prometheus are what I've heard to be the best at those respective parts, so that makes sense. Do you mean barrel spacers other than the PDI ones I linked up there? The PDI barrel is much thicker in the middle, is the stock one like that too? That would matter if I got a standard-thickness inner. I have the Creation loading fin, that's the only internal part I've changed, and I did right away. By "aggressive" rubber, you mean hard vs soft rubbers, right? I'd heard the PDI cylinder is tighter, but the stabilization rings are plastic so sanding shouldn't be hard to do.
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