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generally, zeke products are better than SD, but the zeke mk23 kit is one of their earlier products and is cast and painted, compared to SD's CNC'd annodized finish
over the years, zeke has gotten a LOT better
I believe mk23's go for mid 2g's; 3.1k is more like a USP expert, if memory serves me
shelling out that much is kind of hard for me to justify seeing as I live bloody far away from a pistol range
well...mk23's arent really in need of any upgrades in the first place
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