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If the 452-255 RNFP & 454424 don’t work well with the blowback rifles, why not ask Tom at Accurate Molds to modify the design for you so it does work?
Buy correct mold. Go bang bang bang.
What’s the problem?
Sounds like these designs are pretty close to what you want because you’re getting them to work already. Can’t be too much modification needed to bring everything together right?