On offer during Mother's Day last Sunday, Airsoft Atlanta still has the PTS/KWA CM4 Centurion Arms AEG available for those who have been looking for one... "The PTS / KWA CM4 CENTURION ARMS ERG - AEG Airsoft Gun.  Metal receiver and rail system with upgraded KWA internal parts for a perfect airsoft high-end gun right out of the box.  FPS is a bit high, so we recommend buying an additional spring with its quick-change spring system.

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.

Gun includes 1 midcap M4 ERG magazine, flip sights, EPS stock and more features.  Battery fits in the rear stock, so 9.6v 1600 nun-chuck or 11.1v li-po or li-ion stick or nun-chuck are good (tamiya plug).  Use KWA ERG magazines or any standard M4 magazines (midcap or highcap).

Features:

• 10inch  PTS Centurion Arms C4 Rail
• 10.3inch CQB Length Barrel
• PTS 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.
• PTS / KWA Enhanced Polymer Magazine (ERG) – New 30/120 rounds switch can fill all your airsoft needs.
• PTS EP Grip – Compact (EPG - C) – More vertical compact grip angle with improved ergonomics
• PTS 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 w/tamiya.

Specifications:

• Color – Black
• Dimension – 720 mm (stock retracted), 800mm (stock extended)
• Weight – 3.30 KG
• Hop-Up – Fully Adjustable
• Magazine Capacity – 30 / 120 rounds (compatible with most M4 mags)
• 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 w/.25g BBs (Hong Kong - USA version may vary)
• Quick-change spring system to lower its FPS.  M120 or M110 recommended.
• Energy Output – ~1.67 Joules native
• Power – NiMH (9.6v 1600 nun-chuck) or LiPo/LiFe batteries (11.1v nun-chuck or short stick)"