G&P GBB Long Railed Handguard with SAI QD System for WA M4A1 Series

G&P GBB Long Railed Handguard with SAI QD System for WA M4A1 Series Metal Construction Licensed by EMG Salient Arms International 20mm Picatinny Rail On Top & Front Both Side With M LOK System Including SAI Barrel Nut Design for M4 / AR-15 / M16 Series Airsoft Gas Blow Back GBB Rifle