This guide details the process of creating a unique hybrid firearm by mating a Panzer Arms AR-57 upper receiver, chambered in 5.7x28mm, to an AR-15 lower receiver fitted with a REAP Weaponries bullpup conversion kit. The video highlights the experimental nature of this build, involving collaboration with other firearm personalities and testing on the range. Expert insights are provided on the assembly and handling of this custom platform.
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