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CM4 C4-10 ERG

PTS Centurion Arms CM4 C4-10 ERG (Electric Recoil Gun)





The PTS Centurion Arms CM4 C4-10 ERG airsoft gun uses an ERG (Electric Recoil Gun) system that is based on the latest generation KWA AEG 3 system.  The ERG simulates recoil via a proprietary Kinetic Feedback System. When used with the proprietary ERG magazine, that is switchable between 30 or 120 round capacity, it is capable of an electrical auto cut-off when the last round is fired. If you are willing to forgo the cut off, the ERG can still use any normal AEG magazine such as the PTS EPM for AEGs.  A quick change spring system allows you to easily customize the fps/m/s of the gun to your specific needs.  Included as standard equipment for the CM4 ERG, are PTS’ highly popular proprietary design Enhanced Polymer Grip, Enhanced Back-Up Sight, Enhanced Polymer Magazine and Enhanced Polymer Stock.


  • 10” PTS Centurion Arms C4 Rail

  • 10.3” CQB Length Barrel

  • Enhanced Back Up Iron Sights (EPBUIS) – consists of a low profile snag-free design that is unobtrusive when collapsed. Blending design with practicality, the EPBUIS includes elevation and windage adjustments as well as dual apertures for close and precise long distance shooting. Allowing the user to be versatile, adapting to any given situation.

  • Enhanced Polymer Magazine (ERG) – New 30/120 rounds switch can fill all your airsoft needs.

  • EP Grip – Compact (EPG - C) – More vertical compact grip angle with improved ergonomics

  • EP Stock (EPS) – a simple yet highly functional collapsible polymer stock. Features unique cheek welds that are both comfortable and practical with storage compartments for tools and utilities.

  • Rear Wired & Li-Po Ready – Can handle the power of 11.1v Li-Po batteries.



  • Color – Black

  • Dimension – 720 mm (stock retracted), 800mm (stock extended)

  • Weight – 3.30 KG

  • Hop-Up – Adjustable

  • Magazine Capacity – 30 / 120 rounds

  • Power Source – KSC/KWA derived proprietary ERG system

  • Shooting Modes – Safe / Semi Auto / Full Auto

  • Outer Barrel Length – 10.30”

  • Inner Barrel Length -  294mm

  • Rate of Fire – 19+ RPS

  • Velocity – ~380FPS (Hong Kong)

  • Energy Output – ~1.67 Joules

  • Power – NiMH or  LiPo/LiFe batteries

CM4 C4-10 ERG
CMR Rail System

PTS Centurion Arms CMR Rail System

PTS Centurion Arms CMR Rail System

CA013490307 – 12.5"



The PTS Centurion Arms CMR Rail is a lightweight, rugged, one piece free float handguard that uses a proprietary barrel nut and gives an AR upper a continuous 12 o’clock rail. 

It was designed with the top 1913 rail for mounting the most common accessories, yet does away with the need for 1913 rail at the 3, 6, and 9 o'clock positions. Accessories can be directly mounted to it with a dedicated, simple, light-weight mount or a conventional 1913 rail section to be added and used if needed.  Additionally, the CMR built in anti-rotation QD sling swivels in 4 positions.

The main objective was to have a smaller, lighter weight, more ergonomic K.I.S.S (Keep It Simple, Stupid) hand guard that maintains or enhances functionality for the end user.


  • Features 4 built in QD sling sockets

  • Free float rail system to enhance accuracy

  • Steel thread inserts for enhanced thread durability.

  • Low profile gas block

  • CMR specific accessories (not included)


  • Color – Black

  • Material – 6000 series Aluminum

  • Dimension – 320 x 50 x 45 mm

  • Weight – 269g

  • Compatibility – PTS Centurion Arms CMR Accessory Pack


CMR Rail Accessory Pack

CA011450807 – Black

CA011450813 – Dark Earth


The PTS Centurion Arms CMR Accessory Pack



The PTS Centurion Arms CMR accessories are made of Dupont™ Zytel High Performance Reinforced Polymer.  Their light weight and small profile helps to maintain a lightweight platform with minimal bulkiness added to the slender CMR rail's cross section. The polymer accessories adhere to the K.I.S.S. (Keep It Simple Stupid) principle and directlyirectly mount to the PTS CMR with threaded fasteners making them easy to install and modify to customize your rifle for your shooting needs. These accessories are interchangeable without having to utilize back plates or to dismantle the rail system itself…thus staying true with the K.I.S.S. system.


The Centurion Arms CMR rail covers have been given a unique golf ball style texture on its surface, providing a very firm grip for the end user’s hands. They maintain as low a profile as possible and their semi-circular edges correspond along the ventilation holes of the rail. The rail covers have score lines on the back to allow the user to custom cut it to a shorter length to fill in the gap between other accessories.


The CMR hand stop also has a golf ball dimple textured surface for a secure grip and only requires a single screw to bolt it down. Its design follows closely to that of the rail cover so they will both transition with each other very well when placed next to one another. The hand stop can be utilized in the front of the rail to grant the ability to place the hand forward without the worry of slipping off the rail.


  • Golfball texturing for a strong gripping surface

  • Low profile, fitting in seamlessly with the proprietary CMR Rail


  • Color – Black / Dark Earth

  • Material – Dupont™ Zytel High Performance Reinforced Polymer

  • Dimension –

       o   3 slots - 52mm (approx. in length)

       o   7 slots - 92mm (approx. in length)

       o   Hand Stop – 32 x 30 x 25mm (approx.)

       o   Rail Cover – 83 x 29 mm (approx.)

  • Weight –

       o   3 slots – 4.5g

       o   7 slots – 8g

       o   Hand Stop – 5.5g

       o   Rail Cover - 8g

  • Compatibility – PTS Centurion Arms CMR Rail Systems

CMR Rail Accessory Pack