CYMA CM.508 M4A1 S-System AEG

If you're getting kitted out for Airsoft on a tight budget and like a primary with a unique look, the CYMA CM.508 M4A1 S-System AEG Rifle is what you need! This lightweight polymer M4/AR-15 platform is part of CYMA's recently revamped "Sport" AEG range, offering unbeatable value for a competitive, skirmish-ready primary!

On the outside, the CM.508 is ready to rock with a SIR style 20mm Picatinny quad rail handguard and 20mm railed receiver, ready for your choice of mission essential accessories. The barrel has 14mm CCW male threading, ready for your choice of muzzle device. Whether you want to run a scope, red dot sight, suppressor, tracer unit, aiming laser, tactical flashlight or just a vertical grip, the CM.508 is ready to be clad with accessories for the elite look!

Made predominantly from high-density polymer but equipped with an alloy outer barrel and alloy version 2 gearbox, the CM.508 is surprisingly well-equipped for the price and is even better in the most recent version! Inside, you'll find 18:1 ratio steel gears running on steel 8mm bushings along with a 6.03mm tightbore inner barrel and rotary HOP-up unit, all of which are compatible with standard M4 AEG aftermarket parts. When we first received our CM. 508s years previously we were impressed and the latest version is even better!

Starting at the front, we can see a polymer birdcage flash hider mounted to the 14mm CCW male threading at the tip of the 14.5-inch alloy outer barrel. The outer barrel's 14mm CCW threading means the CM.508 is ready to be kitted out with a tracer unit for CQB specialists or a suppressor for the sneaky skirmisher, though the pre-installed birdcage device completes the military-issue look. If you find the pre-installed flash hider hard to remove, we recommend submerging it into warm water for a minute or two to loosen it and then attempting to unscrew it.

Moving along the outer barrel, we can see the military-style M4A1 barrel profile, complete with M203 grenade launcher mounting cutout. The front sight follows as we reach the handguard, constructed from polymer and replicating the real steel A.R.M.S flip-up front sight. The sight can be deployed simply by lifting it up and stowed again by holding down the circular button on the right side before folding it down. The presence of flip-up sights means you'll have a clearer sight picture when using a red dot sight or scope, ensuring you get a wide field of view and an unobstructed sight picture.

Following the front sight, we come to the handguard assembly which replicates the real steel A.R.M.S SIR, an upgraded handguard used by Green Berets and Navy SEALs during the early Global War on Terror era. The handguards are made from lightweight ABS polymer equipped with a monolithic 20mm Picatinny rail running along the top, with short rails at the 3, 6, 9 and 12 o'clock positions.

The extended top rail provides far more room on the receiver and handguard than most M4 rifles, meaning you can mount bigger scopes and even red dot sight and magnifier combos. Being a monolithic design means the rail extends all the way from the front to the rear, benefitting from a stronger design than comparable RAS handguards. 20mm Picatinny rails allow 20mm Picatinny accessories to be fitted wherever you need them, including vertical and angled foregrips, laser aiming devices, tactical flashlights, bipods and more!

Mounted to the left side of the handguard, we have our first sling point; a standard alloy footman loop compatible with a wide variety of sling types. This can be paired with the rear sling point on the sliding stock to fit a two-point rifle sling to take the burden off your arms or allow for easy transitions to a sidearm.

The handguard also serves as the battery compartment in this "front-wired" M4 AEG. To access the compartment, simply turn the polymer screw-style locks on each side by 270 degrees (to the rear of the side rails, next to the small embossed padlock symbol). Once turned, the locks should pop out but stay retained in the handguard, allowing the lower handguard section to slide forward and lift free. Inside, you'll find a mini-Tamiya battery connector to which you connect your battery.

The set includes an 8.4V 1100mAh NiMh battery and a basic USB charger, though if you're going for an aftermarket battery please ensure you're using the correct charger for your choice of battery. We recommend using a 9.6V 1600mAh NiMh with an NiMh charger for a better trigger response, rate of fire and battery life but the included 8.4V battery should get you going if you're on a tight budget. A quick reminder: never leave your battery on charge unattended!

Moving rearward we reach the receiver, a standard M4/AR-15 milspec design with a 3-position fire selector switch and all the details a proper replica needs. The receiver is constructed from high-density polymer with a matt black finish and features a unique serial number just above the trigger. The fire selector switch is located on the left side of the AEG and sits directly above the pistol grip to provide fast and easy access for right-handed shooters. The fire selector's 90-degree throw between modes makes it quick to operate but not too easy to accidentally knock it and end up in the wrong fire mode. Each fire mode is indicated with recessed text, reading "SAFE - SEMI - AUTO", just like a real M4A1 rifle.

At the centre of the left side of the receiver, we can find the "ping pong paddle" dummy bolt release catch which doesn't have a function in an Airsoft AEG but is included to keep the externals looking realistic. The bolt release is a separate part which is a nice touch to avoid the tell-tale signs that this is an Airsoft gun and not the real deal. Over on the right side of the receiver, we can see what is known as the forward assist button, located on the upper receiver behind the mock shell deflector. This button also has no function but serves to force the real M4/AR-15 bolt carrier into battery if it fails to close due to dirt ingress. The button can be pressed and is also a separate part, keeping things visually accurate to the real thing. 

The magazine release is on the right side of the magazine well and is ideally positioned to be pressed with the trigger finger from a firing grip for right-handed users. Left-handed users can use their support hand thumb to press the release, and this can be done quite fast with a little practice. The surface of the mag release is textured to provide the necessary gripping qualities, and is protected from accidental presses by the "magwell fence", a raised protrusion in the receiver which stops the mag release from catching on your gear as you move.

The CM.508 is packaged with a 300rnd High-capacity magazine which can be filled through the fill window on the top of the magazine body and tensioned via the winding wheel on the bottom. Wind the wheel 5-10 times or until you hear the noise change, after which you can insert the mag and get busy! If you notice feeding stop, wind the wheel again to continue shooting.

At the top rear of the receiver, you'll find the charging handle of the CM.508 which doesn't need to be pulled before the first shot. Instead, this serves to open the dust cover and retract the mock bolt carrier, revealing the rotary HOP-up adjuster inside. The adjustable HOP-up unit allows you to adjust the amount of backspin applied to your BBs and tune the CM.508 for your ammo weight of choice, looking for the flattest possible trajectory. 

We recommend using 0.25g BBs as they are great for both indoor and outdoor skirmishes. As part of our latest batch of CYMA Sport AEGs, the CM.508 improves over the earlier version with the rotary HOP-up design, the latest and greatest design for M4 AEGs offering improved accuracy and the ability to hold its setting under the vibrations of full-auto fire.

As we reach the rear, we come to the 5-position M4/AR-15 buffer tube, offering 5 adjustment positions for the pre-installed "Colt LE" style stock. Adjusting the stock is as simple as pressing the lever on the bottom and sliding it into your position of choice, accounting for almost any body type or loadout.

The LE stock was first introduced in the 1990s with the original M4, improving on the older XM177/CAR15 stock with extra sling options, a more comfortable cheek rest and a serrated butt plate for optimal traction in any weather conditions. The original sling slot for "strap" slings is present and at the toe, we have a footman loop for cavalry-style sling setups.

Inside, the CM.508 is very well equipped for the price, boasting full Tokyo Marui M4 AEG compatibility as a bonus. Inside, you'll find an alloy version 2 gearbox with a quick change spring system, 18:1 standard ratio steel gears running on 8mm steel bushings, reinforced polymer compression components and a type 1 cylinder.

Also inside is a 6.03mm tightbore inner barrel paired with the latest HOP-up unit design for the M4/AR-15 AEG platform, known as the "Rotary" type. The tightbore barrel improves accuracy potential and air-efficiency and the rotary HOP-up provides less side-to-side shot deviation for a tighter grouping downrange, especially in full-auto.

If you're eyeing up your first Airsoft AEG or need an affordable and reliable backup with a unique look, the CYMA CM.508 M4A1 RIS CQB AEG Rifle is ideal. With skirmish-competitive performance, the ability to add a plethora of accessories and upgradeability for a future-proofed setup, the CM.508 is a great value entry point into the world of Airsoft skirmishing!

Features

• Airsoft AEG - Powered by a rechargeable battery
• High density polymer build - Feels agile but not flimsy
• 6.03mm Tightbore inner barrel - Great accuracy potential
• 14mm CCW Male threaded outer barrel - Tracer/suppressor ready
• M4/AR-15 A.R.M.S Style folding front sight post - Flip the front sight down for a clearer view down an optic
• 20mm Picatinny SIR/S-System quad-railed handguard - Add a vertical foregrip, flashlight or laser
• 20mm Picatinny railed receiver - Ready for a red dot sight or scope
• Ghost ring iron sights - Flip up front and rear sights, rear sight is fully adjustable
• 3 Position fire selector switch - SAFE - SEMI AUTO - FULL AUTO
• Rotary adjustable HOP-up unit - Pull and hold back the charging handle to access
• Realistic M4A1 receiver features - Dummy bolt release & forward assist button
• Sling points front and rear - We recommend using the front sling point & the loops on the stock
• 5-Position M4/AR-15 Buffer tube - Adjust the stock to suit your body type and preferences
• LE stock pre-installed - Grippy serrated butt plate, low profile design with built-in sling point
• 300rnd High-capacity magazine included - Plenty of BBs on tap!
• Front wired: Mini-Tamiya battery connector - Recommended battery: 7.4V 1300mAh LiPo or 9.6V 1600mAh NiMh
• Version 2 gearbox
  • Alloy shell
  • 18:1 Steel gear set
  • 8mm Steel bushings
  • Reinforced polymer piston
  • Reinforced polymer piston head
  • Type 1 Cylinder
• Compatible with M4/AR-15 AEG magazines - Spares are plentiful!

Package Includes

• CYMA CM.508 M4A1 S-System AEG 
  • 300rnd High Cap Magazine 
  • 8.4V 1100mAh NiMh Battery
  • USB Charger
  • Cleaning/unjamming rod