Circle Square Firearms sells firearms, ammunition, and related products. You must be at least 18 years of age to enter.
Some products and transactions may require additional verification and a higher minimum age (21 for handguns under federal law).
FN
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The FN-designed 5.7x28mm caliber standardized in 2020 by NATO was originally designed in the late 1980s for use with the military issued FN P90® and FN Five-seveN® pistol. With three decades of trusted use the FN 5.7x28mm drastically improves range accuracy and terminal performance from small arms with the hyper velocity bottleneck pistol cartridge.
