ARES 145mm M LOK System Handguard Set (Dark Earth) Spring Internal Constructed of plastic material that

Constructed of plastic material that is both light and durable Suitable for VFC Knight PDW Series Airsoft Electric Rifle Gun 120 Rounds Loading Capacity

Stainless steel Construction

They are nothing more than a holder for your bbs as you load it into the cylinder of your revolver

VFC SABER 8 inch M LOK System Handguard for M4 AEG / GBB Rifle (Dark Earth)

Include Piston

ARES 145mm M LOK System Handguard Set (Dark Earth) Spring Internal Constructed of plastic material thatARES 145mm M LOK System Handguard Set (Dark Earth) Metal Construction M LOK System Handguard With 20mm Rail on Top Comes with Metal barrel nut Suitable for M4 M16 Series Airsoft Electric Gun AEG Rifle Length: 145mm