Airtac Customs x MAC Gen 2 CRBN Gearbox

• Machine milled to perfection
• Included Gate Pulsar Spacers
• Included Trigger Board Screw
• Upgraded Dual Tensioning grub screws to eliminate engine wobble
• Gearbox screws for both halves
• Allows compatibility of a CRBN Upper with any drop-in HPA engine
• Does not include selector plate

Compatible with:

• [CRBN] G&G-style V2 Lowers (SSG1, ARP9, SSG556, etc)
• Any other V2 lower, upper, and grip.