M4 SOPMOD Block 3 11.5" Airsoft Assault Rifle Sports Line ETU [S&T]

The Sportline series by S&T **has been designed for newcomers to airsoft** as well as intermediate players looking for a **reliable, durable, and affordable M4 replica**. The M4 SOPMOD model stands out with its lightweight yet **robust polymer body reinforced with nylon fiber**. Steel and metal components further increase durability and give the replica a realistic appearance and handling feel. Inside, the replica is equipped with a **reinforced V2 gearbox**, featuring a quick spring change system and an **ETU (Electronic Trigger Unit)**. This combination ensures an instant trigger response, efficient power consumption, and reduced wear on internal components—leading to longer lifespan and consistent performance, even under heavy use. Interestingly, carbines in the SOPMOD Block 3 M4 configuration are currently used by operators of the **1st Special Forces Group (Airborne)**, known as the Green Berets, but also **DEVGRU** by which makes this model not only practical, but also attractive for fans of modern special forces units and military reenactment.@@@

# Durable Build and Expansion Capabilities

The M4 URG-1 is built for dynamic airsoft skirmishes, both in open terrain and CQB environments. Its modern **polymer composite construction** offers excellent resistance to mechanical damage while maintaining low weight for agile and comfortable handling.

Key external components such as the trigger, trigger guard, charging handle, QD sling mounts, and outer barrel are made of **metal or steel**, adding to the realism and ensuring durability during intensive gameplay.

The **front M-LOK handguard** allows for a wide range of tactical accessories—such as [foregrips](https://www.taiwangun.com/vertical-angled-fore-grip), [lights](https://www.taiwangun.com/lights-lasers), or lasers—to be mounted. A 22 mm Picatinny rail runs along the top of the receiver and handguard, allowing for the easy installation of [optics](https://www.taiwangun.com/red-dot-sights) and aiming devices.

At the rear, the 6-position adjustable SF stock offers customizable length for different users and houses the Li-Po battery compartment. The removable flash hider reveals a 14 mm CCW thread, ready for a silencer or other muzzle devices.

# Faster response, higher precision, longer lifespan

The replica is equipped with an **ETU** using low-resistance wiring for smooth operation. This **system provides faster and more accurate motor activation**, replacing the traditional mechanical trigger switch. With electronic control, trigger response is instantaneous and shots are more precise. The ETU also minimizes component wear, offers better energy management, and extends the replica's lifespan while improving compatibility with modern batteries.

# Reinforced V2 gearbox

The M4 BLOCK 3 airsoft rifle features a reinforced V2 gearbox, designed for reliability and smooth operation. The manufacturer has used high-quality components to ensure stable performance. With a rotary-type hop-up chamber compatible with TM and a precision inner barrel, the replica assure good accuracy and shot consistency. The entire construction has been developed with a focus on durability and efficiency, making S&T replicas a good choice for both beginners and more advanced players.

# The set includes:
- M4 SOPMOD Block 3 rifle replica
- 150-round Mid-Cap magazine
- Folding sights
- 22mm Picatinny rail set