M4A1 RIS 14.5" CGS LS Gas Blowback

CYMA M4A1 RIS 14.5" CGS Lightning Series GBBR Airsoft Rifle (Black)

The CYMA M4A1 RIS 14.5" CGS LS GBBR is a hard-running gas blowback M4 designed for players who want realistic controls, a strong recoil impulse, and a platform built for long-term reliability. Developed around the modern CYMA CGS gas system in cooperation with T8 SP Systems, it follows the proven Tokyo Marui MWS (Z-System) concept and supports the same magazine standard—ideal for milsim, training, and immersive weekend skirmishes.

This Lightning Series (LS) version features an aluminum bolt carrier to reduce reciprocating mass and speed up the cycle. The result is a more responsive feel, a higher potential rate of fire, and a lively, realistic shooting experience—backed by a fully metal aluminum receiver set and a high proportion of steel internal components.

What makes the CGS LS stand out

• MWS-inspired CGS gas system for stable cycling and excellent upgrade ecosystem
• Upgraded steel adjustable trigger mechanism (CGS / MWS T8 SP Systems) with crisp pull and long service life
• Lightning Series aluminum bolt carrier for faster cycling and improved trigger response
• Strong blowback and realistic AR15 dimensions for authentic handling
• Tokyo Marui MWS magazine compatible for easy spare mag sourcing

QD Hop-Up + 6.03mm Precision Barrel (built for consistency)

The rifle uses a metal QD hop-up chamber with TDC-style pressure adjustment via screw, so you can fine-tune hop without unnecessary disassembly. A 70° T8 hop-up bucking (GBB/VSR type) works reliably with heavier BBs, and the 360mm / 6.03mm precision inner barrel helps tighten groupings while improving gas efficiency.

RIS setup: ready for serious accessories

The classic RIS handguard and upper rail give you the mounting space you need for a red dot, white light, PEQ-style unit, or vertical grip—perfect for a “duty-style” M4A1 build. The 4-position stock makes it easy to switch between CQB length and outdoor stability in seconds.

Need gas, mags, or optics? Check Gas & CO2 and browse more replicas in Airsoft Guns. Shop the brand here: CYMA Collection.

Maintenance note (recommended)

• Clean excess factory grease around the nozzle, hop-up area, and trigger group.
• Lightly lubricate seals and moving parts with quality silicone oil.
• Do not get oil/grease into the hop-up chamber or onto BBs—range and accuracy will suffer.
• After cleaning, apply and adjust hop-up before play to prevent BBs dropping through the barrel.

Package contents

• CYMA M4A1 RIS 14.5" CGS LS gas blowback rifle
• CGS gas magazine (30 BBs, metal)
• RIS vertical grip
• Flip-up sights
• Speed loader

Specifications

Type	Gas Blowback Rifle (GBBR)
Platform	AR15 / M4A1 RIS 14.5"
System	CYMA CGS (Lightning Series)
Gas Type	Green Gas
Fire Modes	Semi / Full-auto
Output	~1.0 J (Green Gas)
Muzzle Velocity	~100 m/s (0.20g BBs)
Recommended BB Weight	0.28g – 0.32g
Hop-Up	Adjustable (metal QD chamber, TDC adjustment)
Inner Barrel	360 mm / 6.03 mm
Magazine	30 BBs (metal) – TM MWS compatible
Length	775–860 mm
Weight	2880 g
Thread	14 mm CCW
Handguard	RIS
Receiver Material	Aluminum (metal)
Bolt Carrier	Aluminum (LS version)
Trigger Mechanism	Steel, adjustable (T8 SP Systems / MWS style)
Blowback	Yes
Color	Black