MM Compensator Fit Guide: Harrier, Seagull and Firefly Compared
Match MM compensators to Harrier, Seagull and Firefly configurations using barrel length, body dimensions and BCAR clearance before ordering muzzle parts.
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The MM Firefly Receiver Set is the core shell of the Firefly platform, the housing that every other Firefly part, from the pump grip to the plunger tube, bolts into. It is aimed at two kinds of buyers: modders swapping out a worn, cracked, or damaged receiver on an existing build, and anyone starting a Firefly from scratch who needs the base frame to build around.
Right now the receiver set ships in Semi Translucent Black, with more colourways confirmed to be on the way, so if you are chasing a specific look it is worth checking back. Because it is the receiver and not a bolt-on accessory, expect it to pair with the rest of the Firefly hardware line, such as the shell lifter, priming bar, and plunger tube, sold separately in this same category.