If you're building PD rounds, neither is a good choice, as both produce lots of muzzleflash.
See the results of my research here... http://jeffreybehr.zenfolio.com/
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An EDC S&W M&P 357SIG. Ten Glocks sold. NRA life member.
"If lethal force is warranted and appropriate under the circumstances, the" (defender) "must shoot until the threat ceases." Pinizzotto, Kern, and Davis, FBI Academy.
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