Specna Arms SA-G01 M4A1 Airsoft Rifle with Grenade Launcher – Black

For those looking to add some serious tactical firepower to their loadout, the Specna Arms SA-G01 M4A1 with Grenade Launcher is more than just a bold-looking replica—it's a field-ready airsoft gun engineered for performance and realism. Combining a durable full-metal build with a functional 40mm under-barrel grenade launcher, this rifle is ready to dominate in both milsim operations and open-field skirmishes. It’s an airsoft platform that doesn’t just look the part—it plays it perfectly.

The externals are crafted from a mix of zinc and aluminium alloys with steel reinforcements in all the right places. This gives the rifle a satisfying heft without being overbearing. The polymer grip, stock, and foregrip are ergonomically designed and durable, ensuring comfort and control during long games. Powder-coated for extra resistance to scratches and corrosion, the SA-G01 can take a beating and still look the business.

But the real head-turner here is the integrated 40mm grenade launcher. Fully functional and mounted beneath the barrel, it brings a whole new dimension to your tactical gameplay. Whether you're clearing rooms, laying down smoke, or causing panic with shower shells, the launcher adds versatility and immersion that few rifles can match. Just pair it with your choice of gas-powered 40mm shells (sold separately), and you're ready to go loud.

Internally, Specna Arms has given this rifle the treatment it deserves. It’s powered by a reinforced Version 2 gearbox featuring 8mm ball bearings, steel gears, and a polycarbonate piston with steel teeth—all tuned for durability and performance. The sealed nozzle and metal cylinder head improve air seal and consistency, while the rotary hop-up allows for easy tuning and reliable BB trajectory. An accurate 315mm inner barrel rounds out the internals, making this rifle capable of pinpoint shots and solid groupings.

The SA-G01 also includes the brand’s Enter & Convert™ quick spring change system. This is ideal for players who hop between outdoor and CQB sites. With the default M120 spring, the rifle clocks in at a punchy ~410 FPS—ideal for long-range woodland play. Need to bring the power down? Swap to the included M90 spring for a game-legal ~310 FPS in just minutes—no gearbox disassembly required.

Up top, the carry handle doubles as a 22mm RIS rail for optics, and flip-up iron sights are included. The outer barrel ends in a 14mm CCW thread for attaching mock suppressors or tracer units. The adjustable SF stock helps tailor the rifle to your frame and loadout. Despite the added weight of the launcher, the SA-G01 handles remarkably well—balanced and responsive, it’s surprisingly easy to manoeuvre.

A 300-round steel hi-cap magazine is included in the box, feeding reliably and offering plenty of BB capacity to support your primary role—even when using the launcher as your backup plan. The rifle is wired to a small Tamiya connector and supports both LiPo and LiFe batteries (not included), giving you reliable and efficient power options for any loadout.

In all, the SA-G01 is a standout in both form and function. It’s the kind of replica that not only looks fantastic on the field but gives you the performance and adaptability to back it up. If you’re looking for something that combines classic M4 functionality with the punch of a grenade launcher—this is it.

Features

• Full-metal construction with steel reinforcements 
• Functional 40mm under-barrel grenade launcher
• Enter & Convert™ quick spring change system
• Reinforced V2 gearbox with 8mm bearings and upgraded internals
• Rotary-style hop-up with 315mm inner barrel
• Adjustable SF stock and ergonomic polymer furniture
• 14mm CCW threaded barrel for suppressors or tracer units
• Powder-coated finish with realistic USMC markings

What you get

• Specna Arms SA-G01 M4A1 rifle with grenade launcher 
• 300-round steel hi-cap magazine
• Mechanical flip-up iron sights
• Additional M90 spring for FPS tuning
• Instruction manual

Details

• Material: Metal (zinc/aluminium alloy & steel), polymer furniture
• Length: Approx. 925mm (adjustable)
• Weight: Approx. 2965g
• Muzzle Velocity: ~410 FPS (M120), ~310 FPS (M90)
• Gearbox: Reinforced Version 2 with Enter & Convert™ system
• Fire Modes: Semi-auto, Full-auto
• Hop-Up: Adjustable rotary
• Inner Barrel Length: 315mm
• Thread Type: 14mm CCW
• Battery Compatibility: LiPo / LiFe (not included)
• Plug Type: Small Tamiya