HTG Airsoft M4E1 ATOM Style EBB Electric Blowback Airsoft < Pre-Order >

Product Components:
- CNC-machined aluminum upper receiver
- CNC-machined aluminum lower receiver
- CNC-machined aluminum MOD 4 M-LOK 13.5-inch handguard
- CNC-machined aluminum stock tube
- CNC-machined aluminum one-piece outer barrel
- CNC-machined aluminum charging handle
- CNC-machined aluminum bolt carrier
- CNC-machined aluminum gearbox
- CNC-machined aluminum hop-up chamber
- CNC-machined steel flash hider
- CNC-machined steel magazine catch
- CNC-machined steel selector
- CNC-machined steel trigger
- CNC-machined steel gear set
- HTG Basic Infinitum Brushless Motor (ATOM-specific specs)
- B5-style grip
- B5-style stock
- 4UAD 4UANTUM Friction Pro Hop-Up Bucking
- 300BLK P-mag style 90-round magazine
- ATOM electronic control system

Basic Specifications:
- Overall Length: 790–885 mm
- Inner Barrel: 285 mm / GBB standard
- Weight: 2,370 g
- BB Type: 6 mm
- Magazine Capacity: 90 rounds
- Hop-Up: Adjustable
- Firing Modes: Safe / Semi-Auto / Full-Auto
- Battery Compartment: Inside the stock tube
- Compatible Batteries: 11.1V dedicated / Stick type / HTG 11.1V 1100mAh / HTG 11.1V 1300mAh
 - Manual: Japanese
- JP Version / 180-Day Peace of Mind Warranty Eligible Product
- Firearms and Swords Control Law Compliance (Below 0.989J)

◇ HTG Airsoft ATOM Concept HTG, developer of the HTG Basic brand, is proud to release its self-developed and manufactured airsoft gun. Based on feedback from everyone who used the pre-production mass-run units, we have reviewed mechanisms and components across the board, repeating improvements and testing. The mass-production model reflecting these results is finally launching. Behind this lies the technology cultivated through developing custom parts for conventional electric airsoft guns, and a clear goal: "Someday, we want to complete a single rifle with our own hands." Thus, the ATOM was born.

ATOM stands for Advanced Toy Operation Machine. True to its name—meaning "atom"—it reinterprets and condenses various ideas and mechanisms born over a 40-year airsoft history into a single platform. What we emphasized in development was not simply high performance, numerical competition, or sheer replica accuracy. Our goal was the true core experience of toy guns: "fun to shoot, fun to operate."

While inheriting the lineage of conventional standard electric airsoft guns, we fundamentally overhauled the drive, control, and structure. By combining a brushless motor and electronic control, we achieved a crisp, stable response and a pleasant operational feedback unique to electric blowbacks.

We also focused on ease of customization and maintenance, designing it so that continued use deepens structural understanding and allows users to enjoy hands-on tuning.

As a "serious toy gun" built earnestly for play, the ATOM proposes a new evolution in electric airsoft guns.

◇ HTG Airsoft ATOM Mechanism Overview The ATOM is an electric airsoft gun that applies conventional electric gun mechanics combined with a blowback action.

In a typical electric gun, the motor operates only the piston. In the ATOM, the cylinder mimics a real firearm bolt, moving the piston and cylinder rearward simultaneously to cock the gun. Afterward, an internal sear mechanism locks only the piston in the rearward position while driving the cylinder forward.

Through this operation, the internal system is constantly maintained in a cocked state, achieving a high trigger response equivalent to pre-cocking. Furthermore, as the cylinder reciprocates back and forth, recoil is generated upon firing—despite it being an electric gun. This model combines an aluminum cylinder and a resin piston, prioritizing snappy operation and durability over excessive recoil as a foundational model.

[Electronic Control System] ATOM's operation requires precise drive control to accurately synchronize the piston and cylinder. This product adopts an electronic control system that achieves reliable and safe operation while keeping configuration as simple as possible.

In addition to basic semi/full-auto switching, it features a binary trigger, 3-round burst function, and ROF (Rate of Fire adjustment). These functions are integrated into a programming mode so that optimal operation is maintained even after user customization or internal tuning.

Furthermore, a piston release function required during storage is built into the electronic control system, safely releasing spring compression and significantly enhancing safety when stored.

[Full CNC Gearbox] ATOM's operating mechanism features a clearly separated configuration: an upper firing mechanism and a lower drive and control mechanism. By giving each an independent role, maintainability, expandability, and operational stability are achieved at a high level.

The gearbox shell and related parts are all precision CNC-machined. Selected metal materials are used, designed with a strong emphasis on durability and stable operational performance.

The ATOM is not merely a finished airsoft gun; it embodies a scientific design philosophy that allows users to understand structures, perform verification, and make adjustments. Therefore, it adopts a structure that facilitates easy disassembly, assembly, and part replacement.

[Firing Mechanism] The firing mechanism is consolidated in the upper half, easily accessible by removing the upper receiver. Replacing the piston, cylinder, main spring, recoil spring, nozzle, and bolt head can be done simply by removing two screws.

This structure not only simplifies repair work but also keeps part shapes as simple as possible to accommodate custom and handmade parts.

The firing mechanism is designed independently of the gearbox shell. As long as outer dimensions match, a wide range of evaluations—such as changes in trajectory and muzzle velocity via smaller-diameter pistons/cylinders, operational characteristics/reaction changes from weight modifications, and the impact of nozzle shape/length on trajectory and range—can be tested much more easily than before. A major feature of the ATOM is this firing mechanism's independence and high expandability.

[Drive Mechanism] The drive mechanism is housed inside the lower receiver. The gearbox shell is CNC-machined, and all drive gears are steel. Stainless steel precision bearings are used for bushings, achieving stable drive even under high loads.

Adjustment clearance is pre-provided to absorb individual variations that tend to occur during gear replacement. Standard-equipped gears are ATOM-exclusive 1:18 gears, but conventional electric gun gears can also be used with modification.

Additionally, by eliminating the tappet plate and anti-reversal latch found in conventional electric guns, setup ease and assemblability are improved, increasing freedom in customization and tuning.

Routine maintenance can be handled solely by air blowing for cleaning and lubrication, requiring no disassembly. Even when disassembly is required, the gearbox can be removed following the same steps as conventional electric guns by removing the grip, magazine catch, bolt catch, and fixing pins.

Although an electronic control board is mounted on the gearbox, it can be replaced without disassembling the gearbox itself. In the rare event of a failure, it can be addressed without disrupting gearbox settings.

Furthermore, the inside of the gearbox adopts a pocket structure that prevents springs and parts from flying out, solving the complicated disassembly/assembly issues traditional electric guns faced and achieving stress-free workability.

[Operational Features] While it does not achieve a complete real-firearm reproduction mechanically, it is designed to provide an operational feel as close to a real firearm as possible:

Equipped with a brushless motor, achieving power-saving and high-speed operation.
Employs a blowback mechanism imitating real firearm operation; recoil is generated as the bolt (cylinder) and piston move backward and forward at high speed after firing.
When the magazine runs empty, the bolt catch activates, holding the bolt open.
Loading the first round can be done by pulling the charging handle.
Swapping magazines from a hold-open state and closing the bolt allows firing immediately.
Removing the magazine after the final round and closing the bolt ejects any remaining rounds inside the body.

[Hop-Up Mechanism] ATOM's hop-up mechanism adopts the TDC system. Adjustment is performed from inside the ejection port using a hex wrench; using a flexible wrench allows easy adjustment without ruining the exterior appearance.

The inner barrel and hop-up bucking adopt the GBBR standard. Consequently, various commercially available hop-up buckings and inner barrels can be used.

In its standard state, it is equipped with the 4UAD 4UANTUM Friction Pro Hop-Up Bucking, achieving stable trajectory characteristics. Because commercial parts can be used directly for repairs and replacements, procuring parts is a major advantage.

The hop-up chamber is CNC-machined and secured inside the upper receiver. It can be easily removed along with the inner barrel even while the upper receiver, outer barrel, and handguard remain assembled.

Furthermore, disassembling the hop-up chamber requires removing only a single screw, eliminating clip breakage and cumbersome disassembly steps seen in traditional electric gun chambers. This structure facilitates replacement work for inner barrels and hop-up buckings, contributing to enhanced maintainability.

◇ Compatibility The ATOM adopts an evolved structure based on conventional standard electric airsoft guns. Therefore, while some exterior and internal parts are compatible, many parts are custom-designed, meaning not all parts can be used without modification.

Exterior Parts:
Upper Receiver: Part of the internal structure has an ATOM-exclusive shape, so modification is required if using a conventional standard electric gun upper receiver.
Lower Receiver: Basic shapes can be used, but custom parts fabrication or modification is required to accommodate the bolt catch mechanism.
Outer Barrel: Conventional standard electric gun outer barrels cannot be used due to different chamber mounting structures.
Handguard: Toy-pitch spec items can be used, but modification or adjustment may be required upon installation.
Grip: Compatible.
Magazine Catch: Compatible.
Stock Tube and Receiver: Semi-fixed, so they cannot be replaced individually.

Internal Parts:
Gears: Conventional standard electric gun gears can be used with modification.
Motor: Conventional standard electric gun motors can be used.
Magazine: M4-spec STD magazines can be used. However, some functions may not operate correctly depending on compatibility with third-party magazines.

(Note: Even for parts listed as compatible, complete suitability is not guaranteed for all products. Installation failures, modifications, or adjustments may be required due to manufacturing specs or individual tolerances.)

Pre-Order Notice
We do not control when will the Pre-Order items to arrive, the Estimated Time of Arrival is provided by manufacturers for reference.
Please beware arrival date may vary, we will keep the customer informed if the supplier has any changes.

Cancellation a Pre-Order
10% of Pre-order as a handling fee will be charged upon cancellation requested BEFORE the Estimated Time of Arrival.
However, if the product is experiencing a significant delay of more than 3 MONTHS, a FULL REFUND will be issued upon cancellation.