AEG Variable Performance System (VPS)
Adjust FPS for indoor and outdoor games.VPS gives quick, easy FPS adjustment built into the gearbox, so one rifle can play anywhere.
VM4A1 AEG Variable Rifle (Cut Off)
$300.00
AEG Variable|Cut-Off|6mm
- KWA AEG adjustable FPS system with 30/120-round empty-magazine cut-off
- Comes with one K120c magazine
- KWA Rewards: earn 300 points ($6.00 store credit). How it works
- Pay over time: 4 interest-free payments of $75.00 with Klarna, or Affirm. Details
- Free shipping on orders over $200 (contiguous US).
Klarna and Affirm are subject to approval. See payment terms. A higher initial payment may be required for some consumers. CA resident loans made or arranged pursuant to a California Financing Law license.
Batteries and chargers not included.
*This product comes with an orange mock suppressor out of the box – black tip in the image sold separately.
We don't give restock dates. Leave your email and you'll get one email if it's back in stock.
KWA · AEG Variable · M4A1 Carbine · 6mm
KWA VM4A1 AEG Variable (Cut Off)
Adjustable FPS and an empty-magazine cut-off
The KWA VM4A1 is a 6mm M4A1-style AEG airsoft carbine with KWA’s Variable Performance System and an empty-magazine cut-off. FPS adjusts from 390 to 440 through the stock with the included tool. It fires semi and full auto, comes with one K120c 30/120-round cut-off magazine, and has a two-piece clamshell handguard, an A2 birdcage and a KWA Crane stock.
390–440Adjustable FPS
30 / 120Rounds, K120c
VPSVariable Performance System
Cut-offStops on empty
18+Rounds per second
7.1 lbWeight
KWA Rewards
Earn 300 points on this item, worth $6.00 in store credit. New members get 100 points for signing up and 500 bonus points on their first order.
How KWA Rewards worksPay over time
Split it into 4 interest-free payments of $75.00 with Klarna, or pay over time with Affirm. Choose either at checkout.
See payment optionsFree shipping
This item ships free, since orders over $200 ship free in the contiguous US.
Shipping detailsKlarna and Affirm are subject to approval. See payment terms. A higher initial payment may be required for some consumers. CA resident loans made or arranged pursuant to a California Financing Law license.
What is the VM4A1?
The VM4A1 is an upgraded M4A1 carbine built around KWA’s Variable Performance System. You adjust FPS through the stock with the included quick-change tool, so one rifle can be set for indoor and outdoor fields. With magazine cut-off compatibility and a switch life extender, it suits MilSim and field players.
It has a one-piece full metal upper receiver, a rotary hop-up and a PTS Enhanced Polymer Grip. It is rear-wired and Li-Po ready, with a reinforced metal gearbox, ambidextrous selector switches, 9 mm ball bearings, an upgraded high-speed gear set and an improved high torque motor.
- Variable Performance System: adjust FPS through the stock
- Quick-change VPS tool included
- 30/120-round empty-magazine cut-off
- Switch life extender to prevent contact burnout
- Improved high torque motor and upgraded high-speed gear set
- Ambidextrous selector switches
- PTS Enhanced Polymer Grip, one-piece metal upper receiver
- Rear-wired, Li-Po ready
VM4A1 Features
Cut-Off Feature
Train your reloads.The cut-off stops the rifle from firing when the magazine is empty, building proper reload technique.
High-Speed Gear Ratio
Quicker trigger response.KWA’s high-speed gear ratio is built for faster cycling, quicker trigger response and a higher rate of fire.
Adjustable Hop-Up
Dial in your BB flight.KWA’s adjustable hop-up lets you fine-tune backspin for accuracy with any BB weight.
30–120 Round Magazine
Adjustable magazine capacity.Switch between a standard 30-round setup for training and a full 120-round load for games.
AEG 2.5 Gearbox
Variable power inside.The reinforced metal gearbox carries the VPS, the cut-off and the switch life extender, with 9 mm ball bearings and precision metal gears.
VM4A1 Specifications
| Performance | |
|---|---|
| Power system | AEG Variable (VPS) with empty-magazine cut-off |
| Velocity | 390–440 FPS, adjustable |
| Rate of fire | 18+ rounds per second |
| Firing modes | Safe, semi-auto, full auto |
| Magazine | K120c, 30 or 120 rounds |
| Hop-up | Adjustable (rotary) |
| Motor | KWA high torque motor |
| ETU | Not ETU-ready |
| Battery | Li-Po/Li-Fe, Deans (T-plug) connector, rear-wired (not included) |
| Dimensions | |
| Length | 32.5 in retracted, 35.75 in extended |
| Outer barrel | 14.75 in |
| Inner barrel | 14.56 in |
| Weight | 7.10 lb |
| Build | |
| Platform | Carbine |
| Handguard | Two-piece clamshell |
| Stock | KWA Crane stock, retractable |
| Grip | PTS Enhanced Polymer Grip |
| Muzzle | A2 birdcage |
| Receiver | One-piece full metal upper |
| Included tools | VPS quick-change tool |
Which magazines fit? See the KWA magazine compatibility chart.
What comes with the VM4A1
In the box
- VM4A1 AEG Variable rifle
- One K120c 30/120-round cut-off magazine
- VPS quick-change tool
- Orange mock suppressor, installed
You will also need
- An AEG battery and charger (not included). Li-Po/Li-Fe with a Deans (T-plug) connector, rear-wired. Ask KWA which size fits.
- 6mm airsoft BBs
- Full-seal eye protection
Popular add-ons
How the VM4A1 works
Adjusting FPS with VPS
The Variable Performance System changes power at the gearbox. On the VM4A1 you adjust it through the stock with the included quick-change tool, within 390–440 FPS.
Fields set velocity limits, often lower indoors than outdoors. Set the rifle for the field you are playing and confirm it at chrono.
How the cut-off works
When the magazine runs empty, the cut-off gearbox stops the rifle from firing. Insert a fresh magazine, disengage the mock bolt catch and keep going.
It builds reload muscle memory for training and games.
Which magazines to use
Standard M4 AEG magazines work in this rifle. To use the cut-off, run KWA’s designated cut-off magazines: the K120C or MS120C.
The included K120c adjusts between a 30-round setup for training and a full 120-round load for games.
Choosing a battery
The battery and charger are not included. This rifle takes Li-Po/Li-Fe batteries with a Deans (T-plug) connector, wired to the rear.
Match the connector, check that the battery fits the stock or battery space, and charge it only with a charger made for that battery type. Ask KWA if you are not sure which size fits.
Hop-up, explained
Hop-up puts backspin on the BB so it lifts and flies flatter and farther. Too little and BBs drop early. Too much and they climb.
- Start with the hop-up at its lowest setting.
- Fire a few shots at a target at your usual distance.
- Add a little hop at a time until BBs fly flat before they drop.
- Back it off if BBs start to rise. Re-check whenever you change BB weight.
VM4A1 vs Ronin X-15 vs Ronin X-18
Three KWA AEG Variable rifles with an empty-magazine cut-off, a K120c magazine, a KWA Crane stock and a rear-wired Deans battery connection.
| VM4A1 | Ronin X-15 | Ronin X-18 | |
|---|---|---|---|
| Velocity | 390–440 FPS, adjustable | 400–450 FPS, adjustable | 400–450 FPS, adjustable |
| Outer barrel | 14.75 in | 15.5 in | 18.5 in |
| Length | 32.5–35.75 in | 32.375–35.625 in | 35.75–39 in |
| Weight | 7.10 lb | 6.5 lb | 6.7 lb |
| Handguard | Two-piece clamshell | 15.25-inch KeyMod rail | 15.25-inch KeyMod rail |
| Muzzle | A2 birdcage | Ronin series mock suppressor | A2 birdcage |
| Rate of fire | 18+ rounds per second | 18+ rounds per second | 19 rounds per second |
VM4A1 care and parts
- Disconnect the battery whenever you are not using the rifle.
- Charge with a charger made for your battery type (NiMH or Li-Po/Li-Fe).
- Keep the inner barrel and hop-up bucking clean if accuracy drops.
- Wipe the rifle down after each game and check screws and the rail before you play.
Find the manual and diagrams in the KWA Resources tab on this page, or in the Manuals & Diagrams library.
VM4A1 FAQ
What is the KWA VM4A1?
A 6mm M4A1-style AEG airsoft carbine from KWA with adjustable FPS (VPS), an empty-magazine cut-off, a clamshell handguard and a KWA Crane stock.
How do I adjust the FPS?
Through the stock with the included quick-change VPS tool. The range is 390–440 FPS. Set it for your field and confirm at chrono.
What does the cut-off do?
It stops the rifle from firing when the magazine is empty. Insert a fresh magazine and disengage the mock bolt catch to keep going.
Which magazines work in the VM4A1?
Standard M4 AEG magazines fit. For the cut-off, use KWA K120c or MS120c magazines. One K120c is included.
What battery does it use?
A Li-Po or Li-Fe battery with a Deans (T-plug) connector, rear-wired. The battery and charger are not included.
Does the VM4A1 have recoil?
No. It is an AEG Variable rifle. For electronic recoil with a cut-off, see the Q10.
Does it come with an orange tip?
Yes. It ships with an orange mock suppressor. The black tip shown in the photos is sold separately.
Can I pay for the VM4A1 AEG Variable Rifle (Cut Off) over time?
Yes. Choose Klarna at checkout to split it into 4 interest-free payments, or Affirm to pay over time. Both are subject to approval. See Payment Options.
Do I earn KWA Rewards points on the VM4A1 AEG Variable Rifle (Cut Off)?
Yes. KWA Rewards members earn 1 point for every $1 on orders of $50 or more, so the VM4A1 AEG Variable Rifle (Cut Off) earns about 300 points, worth $6.00 in store credit (50 points = $1). See KWA Rewards.
Is the VM4A1 covered by a warranty?
Every KWA gun is backed by KWA, with warranty support and in-house service in California. Protection Plus adds extended warranty coverage and a repair plan with no repair fee, discounted parts and free return shipping. See the Protection Plus page for plan details.
KWA Airsoft
Built to Run, Backed by KWA
KWA warrantyEvery KWA gun is backed by KWA.
Protection PlusExtended warranty coverage plus a repair plan with no repair fee.
In-house serviceRepairs and support from KWA in California.
Parts and manualsOrder parts by part number and download diagrams.
| Weight | 8.5 lbs |
|---|---|
| Dimensions | 41 × 10 × 4 in |
| Mag Type | AEG, M4/AR15 |
| Rail Style | Standard Handguard |
| Rounds | 120, 30 |
| Stock Type | Retractable |
| Power System | AEG Variable (cut off) |
| Platform | Carbine |
Specifications
- Length (Retracted): 32.50“
- Length (Extended): 35.75“
- Height: NA“
- Outer Barrel Length: 14.75“
- Inner Barrel Length: 14.56“
- Magazine Capacity: 30/120
- Weight: 7.10
- Gearbox: AEG Variable
- Electronic Trigger Ready: NO
- Rate of Fire: 18+
- Velocity: 390-440 ADJ. FPS
- Power Source: Li-Fe/Li-Po (Deans Connector/T-Plug) Rear Wired
- Operation: LITHIUM POLYMER
- Adjustable Hop Up: YES
- FPS Range: 390-440 ADJ FPS
- Firing Modes: SAFE, SEMI AYTO,FULL AUTO
- Motor Type: KWA HIGH TORQUE MOTOR
- Stock: KWA CRANE STOCK
- Rail Type: CLAM SHELL, 2 PIECE HAND GUARD
- Muzzle Device: A2 BIRDCAGE
- Compatible Magazines & Additional Features: EMPTY MAGAZINE CUT OFF, ADJUSTABLE VPS TOOL INCLUDED
KWA Resources
- Variable Performance System (new)
- Switch Life Extender to prevent contact burnout (new)
- Fully adjustable FPS through stock with provided quick change tool (new)
- 30/120rd. magazine cut off (new)
- PTS® Enhanced Polymer Grip (new)
- Rotary hop up (new)
- One-piece upper receiver
- Improved high-torque motor (new)
- Upgraded high-speed gear set (new)
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