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.
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August 2026 on GunPartPicker
New Frontier Armory C5 9mm AR-15 Lower - MP5 ranked #137 of the 507 lower receivers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #165 of the 993 lower receivers builders have added. Builds with this lower receiver are nearly all AR-10.
Updated · from real builds on GunPartPicker
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