Echo1 BTS Mod 2 Full Metal M4 AEG Airsoft Rifle – PDW Stock, M-LOK Handguard & MOSFET Trigger (JP-140)

The Echo1 BTS Mod 2 (JP-140) is a compact, full-metal M4-style automatic electric gun (AEG) designed for lawful airsoft use, target practice, and collection. It combines a carbine-length barrel arrangement with a collapsible PDW-style stock, creating a maneuverable platform with the familiar handling and magazine compatibility of an M4-style AEG.

The BTS Mod 2 features a full-metal upper and lower receiver, M-LOK rail system, functioning bolt catch, flip-up sights, and a drop-free M4-style magazine system. Internally, it uses a Version 2 gearbox platform with a quick-change spring system, MOSFET, and microswitch trigger configuration.

Key Features

• Echo1 BTS Mod 2 full-metal M4-style AEG platform
• Compact PDW-style collapsible stock with rear battery storage area
• Full-metal upper and lower receiver construction
• M-LOK handguard / rail system for compatible accessories
• M4/M16-style magazine platform with drop-free magazine release
• Includes one 120-round M4-style mid-cap magazine
• Compatible with 120-round mid-cap, 300-round high-cap, and other compatible M4-style AEG magazines
• Adjustable hop-up chamber accessed through the ejection-port area
• Safe, semi-automatic, and full-automatic firing modes
• Functioning bolt catch and flip-up front and rear sights
• Version 2 gearbox platform with quick-change spring system
• MOSFET and microswitch trigger configuration

Performance Information

Published velocity specifications for the Echo1 BTS Mod 2 can differ by production batch, retailer version, spring configuration, BB weight, hop-up setting, battery output, maintenance condition, and chronograph method. A currently published retailer specification lists approximately 300–320 FPS with 0.20g BBs. Always chronograph the product using your intended BB weight and confirm compliance with your local field limits before use.

Product Specifications

Brand	Echo1
Model	BTS Mod 2 / JP-140
Product Type	Automatic Electric Gun (AEG)
Caliber / BB Type	6mm airsoft BBs
Power Source	Electric AEG; rear battery compartment in PDW-style stock
Battery and Charger	Not included
Fire Modes	Safe / Semi-Automatic / Full-Automatic
Muzzle Velocity	Approx. 300–320 FPS with 0.20g BBs; actual results vary by production batch and test conditions
Hop-Up	Adjustable
Magazine Platform	M4/M16-style AEG magazines
Included Magazine	1 × 120-round M4-style mid-cap magazine
Compatible Magazine Options	Compatible M4-style 120-round mid-cap, 300-round high-cap, and other AEG magazine options; fitment may vary by brand
Gearbox	Version 2 gearbox platform with quick-change spring system
Trigger Electronics	MOSFET and microswitch trigger configuration
External Construction	Full-metal upper and lower receiver
Stock	Collapsible PDW-style stock
Handguard	M-LOK rail system

Package Includes

• 1 × Echo1 BTS Mod 2 Full Metal M4 AEG (JP-140)
• 1 × 120-round M4-style mid-cap magazine
• 1 × Cleaning rod
• 1 × Flip-up front sight
• 1 × Flip-up rear sight

Important Purchase Notes

• Battery, battery charger, BBs, and BB loader are not included unless specifically stated otherwise.
• Use only suitable 6mm airsoft BBs and a battery compatible with the installed connector and manufacturer guidance.
• Actual velocity may vary with BB weight, hop-up setting, battery output, temperature, internal condition, and testing procedure.
• Magazine compatibility can vary among brands. Confirm compatibility before purchasing spare magazines.
• Verify local laws, age restrictions, transportation requirements, and field regulations before purchase or use.
• Product photos, packaging, markings, orange-tip configuration, and included components may vary by production batch and destination requirements.

Safety Notice

• For lawful airsoft use only.
• Always wear properly rated eye protection and follow all applicable field safety rules.
• Never point the product at people or animals outside a controlled and lawful airsoft environment.
• Remove the magazine, clear the chamber, engage the safety, and store securely when not in use.

Frequently Asked Questions

What is the FPS?

Approximately 300–320 FPS with 0.20g BBs as specified for this model. Actual readings vary with temperature, gas pressure or battery charge, BB weight, and hop-up setting, so always confirm against your field’s chrono limits before a game.

What firing modes does it have?

It offers semi-automatic and full-automatic fire with a safety position on the selector. Use full auto in short bursts — it empties the magazine and drains gas or battery noticeably faster than semi.

Is the hop-up adjustable?

Yes. The hop-up is adjustable, so you can dial in lift for your BB weight. Adjust in small steps and test between changes — small movements make a visible difference downrange.

What powers it?

It is an electric AEG: a rechargeable battery pack drives the gearbox. Battery and charger are not included (see the package list above), so budget for a suitable pack and a smart charger if you do not already own them.

Is it full metal?

Yes — the main external construction is full metal, which gives it a solid, realistic weight. Metal parts still need normal care: keep moving surfaces clean and lightly lubricated.

What is included, and what do I need separately?

The package contents are listed in the description above. A battery and charger are not included and are sold separately.

What warranty and shipping cover this item?

It is covered by the Airgrix 30-day limited warranty and ships from our California warehouse. At $349.99 it qualifies for free US shipping on its own (free on orders $59+). Returns are handled under the store returns policy — see our Ordering, Shipping & Warranty FAQ page for the details.

Questions about setup, fitment, or care? See our Product FAQ and AEG Upgrades FAQ.