Ares VZ58 Side Scope Mount Rail Colt M4A1 Nozzle and Hard Piston with

Nozzle and Hard Piston with 7 Metal Teeth  Metal Piston Head w/ Bearings  Cylinder For 301 - 400 mm Inner Barrel  Durable Tappet Plate  Metal Anti-reversal Latch  Spring Guide with Bearings  M135 Spring  Completed Gearbox set ready to upgrade  Anti-Heat & Anti-Wearing Construction  Suitable for AEG brand: King Arms & Other Compatible M4 / M16 Series AEGs  As always

which is half way between the Belt and our ISS MULE

3390 (with box)

Socket set screw require low strength thread lock glue to set

Nylon Fiber Handguard for 556 HOLO  - 7mm Bearing Gear Box with Brand New Designed Bolt Carrier Operating Mechanism  - One Piece Metal Outer Barrel  - Ambidextrous Selector  - Railed Flat Top for scope and red dot sight  - Stylish Flip-Up Front Sight & Low Profile Flip-Up Rear Sight  - 135 Rounds SIG556 Nylon Fiber Magazine (Also compatible with M4 / M16 Magazine)  - Compatible to Other Brands Reinforce Parts (Except the Piston & Nozzle)  -Trademark of SAN

Ares VZ58 Side Scope Mount Rail Colt M4A1 Nozzle and Hard Piston withOn the left side of the VZ58 receiver is a slot for the Side Scope Mount Plate which in turn will allow you to slide on a Side Scope Mount Rail so you can add any sight you prefer to it.