This is the Gorilla GF-10 handguard for our 8.6 Blackout and any .308. This premium handguard is designed to bring you strength and stability while keeping your rifle lightweight. The M-LOK attachments allow you to add any fixtures you need to make your shooting experience completely yours! Top picatinny rail sections at the rear and front of the rail for optional attachments Compatible with low profile gas blocks Compatible with AR308 upper receivers and barrels Our GF-10 handrails are 1.51 in diameter All rails come with our proprietary barrel nut and clamps. All of our products are Made In America!