The KEYMOD rail lengths are made of alloy with other alloy parts including buffer tube, outer barrel, charging handle, flash hider and more. The Ares Amoeba OCTA ARMS PRO SR16 features Ares' new EFCS gearbox system (Electronic Firing Control System) that allows the gearbox to be programmed to be a semi, 3 round burst or full auto.  

 

7'', 9'', 10'', and 15'' feature a Muzzle Break Style Flash Hider

12'' Variants feature a Sound Enhancing Flash Hider
13'' Variants feature a Standard Bird Cage Style Flash Hider
Programmable with Ares Amoeba Electronic Gearbox Programmer EFCS
ARES EFCS Gearbox
Electronic trigger
Alloy ARES etched receiver
Adjustable polymer hop unit
Alloy KEYMOD style hand guard
Adjustable front and rear sights
BLADE style trigger
Functional bolt stop release button / catch
2 toned pistol grip with rubber palm and finger contact patches
14mm CLOCKWISE threaded outer barrel
Quick spring change
Polymer hop-up
STANAG style hi-capacity magazine
Incredibly solid construction 
QD rear sling point included that secures into the stock tube/buffer plate
Easy to remove 5 position stock
Alloy outer barrel and free float gas block
Trigger finger rest plate trigger guard
Alloy ejection button
Alloy dust cover and charging handle
Sights flip up and down
Incredible trigger response 
Alloy locking receiver body pins
6 point locking/securing bolt keymod rail to upper receiver

Polymer 

Alloy

7.4v Li-Po Stick 

Ares Amoeba PRO Octarms M4 with EFCS KM Series 

Manual

Magazine