New Frontier Armory C5 9mm AR-15 Lower - MP5
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New Frontier Armory
Overview
The New Frontier Armory C5 9mm AR-15 Lower is a stripped lower receiver designed specifically for the AR-9 platform, making it an excellent foundation for building a 9mm firearm. With a standard trigger pin size of .154, this lower is compatible with a wide range of aftermarket parts, allowing builders to customize their setup to their preferences. This lower is typically used in builds focused on 9mm caliber configurations, catering to those looking to create versatile and compact firearm options.
Specifications
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October 2026 on GunPartPicker
New Frontier Armory C5 9mm AR-15 Lower - MP5 ranked #251 of the 588 lower receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #195 of the 1,220 lower receivers builders have added. Builds with this lower receiver are nearly all chambered in 9mm, nearly all on blowback gas, and nearly all AR-9.
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Frequently Built With
The part most often added in each category by the builds that include this one
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