Description
S&T ST320A1 Grenade Launcher (40mm Cartridge, Black, ST-GL-M320)
The S&T ST320A1 is a 40mm airsoft grenade launcher styled on the M320A1, the modern grenade launcher that can be fitted beneath a rifle or used on its own with a stock. It fires 40mm gas cartridges (often called MOSCART shells), so it gives a support player or grenadier a way to put a shower of BBs onto a position from cover.
S&T makes a wide range of good-value replicas, and the launcher gives you a lot of flexibility: use it as a stand-alone launcher with its stock, or remove the stock and fit it under a rifle. A UK retailer listing for S&T’s M320A1 gives the details below.
Build and design
The listing describes an alloy barrel, chassis and stock, with polymer used for the pistol grip, trigger, fire selector, sights and folding grip, steel pins, screws and springs, and a rubber butt plate. It gives a weight of about 2kg and a length of about 35.5cm with the stock collapsed and 49cm extended, with an outer barrel of about 8.5 inches.
The barrel swings to the side for loading, just like the real M320, and the barrel release and fire selector are listed as ambidextrous. Flip-up ladder sights help with arcing shots at range, and the listing says they are reversible for left-handed use.
Mounting options
The listing describes a sliding, removable stock with five positions and a sling point. As a stand-alone launcher, it is ready to go with the stock fitted. Remove the stock and the launcher can be mounted to a 20mm Picatinny rail on a suitable rifle. A folding vertical foregrip on a 20mm rail can be swapped for another 20mm grip.
When mounting under a rifle, make sure the launcher is secure and that the rifle’s rail is strong enough to carry the extra weight.
How it works
The launcher itself has no power source: all the power comes from the 40mm gas cartridge you load into it. Fill and load the cartridge with BBs as its instructions describe, load it into the barrel, close the barrel and fire. Each shot fires the BBs held in the cartridge at once. The listing gives single-action firing with a trigger-lock safety, and a suggested BB weight of 0.25g.
Key features
- M320A1-style 40mm grenade launcher
- Fires 40mm gas cartridges (MOSCART type)
- Stand-alone with stock, or rail-mounted under a rifle
- Five-position sliding, removable stock (as listed)
- Side-swinging barrel for loading
- Ambidextrous selector and barrel release (as listed)
- Flip-up ladder sights (as listed)
- Folding vertical foregrip on a 20mm rail (as listed)
- Alloy barrel, chassis and stock (as listed)
What’s in the box
- S&T ST320A1 grenade launcher (the UK listing shows the launcher only)
Compatibility
The launcher takes standard 40mm airsoft gas cartridges (MOSCART-type shells), which are not included. Our shop stocks a range of 40mm gas cartridges; check the length of the shell against the launcher before buying, as very long cartridges may not fit every launcher.
For rifle mounting, use a sturdy 20mm Picatinny rail section under the handguard. Use the gas recommended for your cartridges, and good-quality seamless BBs.
Care and maintenance
Never store cartridges with gas in them for long periods, and lubricate their seals with a little silicone oil as their instructions describe. Keep the launcher’s barrel and locking mechanism free of grit, and check the barrel latch locks fully before each shot.
Wipe the launcher over after wet or muddy games, check rail screws and mounting hardware regularly, and store it somewhere dry. Remove any loaded cartridge before storing or transporting the launcher.
Who is it for?
The ST320A1 suits grenadiers and support players who want a versatile 40mm launcher that can be carried on its own or mounted under a rifle, and milsim players building a modern loadout.
Please note: 40mm gas cartridges, gas and BBs are not included. Check your site’s rules on launchers before play. Always wear suitable eye protection, and full-face protection where your site requires it, when using or testing any airsoft replica.
