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CMMG
Overview
The CMMG Banshee 100 MK57 5.7x28 Complete Upper - 8" is a upper receiver. Compare prices from multiple merchants and find the best deal.
Specifications
Build history on GunPartPicker
Builders on GunPartPicker first added the CMMG Banshee 100 MK57 5.7x28 Complete Upper - 8" to a build in June 2026.
It was out of stock everywhere we track for all of September 2026, and today none of the 2 retailers we track has it in stock right now. Listed prices start at $749.95 at AR15 Discounts for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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