GG&G's under foregrip rail offers mounting from the six-o-clock position on the foregrip of your AR-15 or M-16. This Picatinny (MIL-STD-1913) rail lets you mount lights and vertical foregrips with ease.
Picatinny Sling Mount
Mounting systems for airsoft guns - Gunfire
Magpul AFG2 Angled Fore Grip
Standard Picatinny Rail for AR-15/M4/M16 Handguards - FAB Defense
OCF - Over Sized Compartment Foregrip with Side Picatinny Rail for
Rail Picatinny Weaver (MIL-STD-1913) – 98mm
Stability XTX Bipod (Picatinny – Adjustable Chassis) – Protean
Under Forearm Integrated Rail for AR-15/M16
GG&G Under Forearm Integrated Rail (UFIR)
Under Foregrip Picatinny 1913 Rail - Mil-STD Forearm Rail Mount System
GG&G STANDARD Rail ライザーマウント□Mil-spec
What is the benefit of rail cover for an AR-15? - Quora