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KWA RM4A1 Electric Recoil Gun ERG EBB Airsoft Rifle

ID: 58791 (AEG-KWA-RM4-A1)
5.0 stars, based on 2 reviews
KWA RM4A1 Electric Recoil Gun ERG EBB Airsoft Rifle
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This item is currently Out of Stock Usually restocked within 1-3 weeks.
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MAP ProtectedExempt From Coupons
The manufacturer of this product enforces a strict minimum advertised price (MAP) policy which excludes this product from any additional discount coupon codes. This item, however, may qualify for free shipping.
CanadaExport Compliant
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.

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KWA RM4A1 Electric Recoil Gun ERG EBB Airsoft Rifle

The KWA RM4A1 ERG is an AR style, Electric Recoil Gun [ERG] that utilizes the patented Kinetic Feedback System [KFS]. This gives the user felt recoil with every trigger pull. All ERG Series rifles feature a mechanical/electrical cut-off system that works in conjunction with the ERG magazines to feed every BB and stop firing when the magazine is empty. Highlighted features of the RM4A1 ERG are metal alloy receivers, MilSpec buffer tube and stock, a flat top rail, which allows operators to customize their weapon configuration, and an operational bolt catch feature that provides the user with unparalleled realism by mimicking fundamental AR15 weapon manipulation. Similar to real AR15 style rifles the RM4A1 ERGs modular design allows limitless customization options to best suit the individuals training and MilSim need


  • Full metal receiver
  • Enhanced AEG gearbox with Kinetic Feedback System
  • Proprietary ERG recoil system
  • Flattop receiver features 20mm accessory rail for mounting optics or other accessories
  • Mechanical / electrical auto cut-off with last round fired
  • Functional bolt release for firing system reactivation
  • Detachable carry handle
  • Adjustable front and rear sights
  • A1 style polymer handguard
  • Adjustable crane stock

Length:770mm-840mm, Adjustable
Weight: 3107g
Inner Barrel: 363mm
Magazine Capacity: 30rd / 60rd Selectable Capacity Magazine. Works with Matrix, G&G, Tokyo Marui and other compatible M4 / M16 Series Standard Airsoft AEG Magazines

Spare Magazines Available Here at

Muzzle Velocity: 390~410 FPS (Measured with 0.20g BBs)
Thread Direction: 14mm Negative
Gearbox: KWA 3GX Full Metal (proprietary)
Motor: Long Type
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine
Battery: 7.4v / 11.1v Small Type LiPo recommended (Wired to the Stock with a Small Tamiya connector. Battery not included)
Hopup: Yes, Adjustable

Manufacturer: KWA

Things you may need to get started:
    Battery and Charger – Required to power your AEG; use a high quality battery and charger for best results.

    Spare Magazines – Stay in the fight longer by bringing more ammo with you.

    BBs – High quality precision 6mm BBs recommended; Use 0.20g – 0.25g BBs for best results.

    Silicone Oil – Basic cleaning and lubrication maintenance help keep your Airsoft AEG in top working order.

2 Customer Reviews

(Write a review)

by Justin C. on 04/17/2016
"Very good rifle out of the box. Using this stock, i was able to outrange a good amount of people on the field and managed to score accurate a precise kills. The recoil has no real negative effects on accuracy, though it does make you work to stay on target which is the whole point of the KFS (Kinetic Recoil System).
-fun to shoot
-good range and accuracy
-heavy and externally solid
-gearbox stock, is not that screechy and not very noticable
-stock houses battery
-fast rof with an 11.1 lipo (performance may vary depending on what company produces said battery)

- Hop-up does not effect BB until at least 10~20 rounds are fired, then the hop-up works well (see it as a warm up)
-eats up battery life pretty quickly compared to other guns, but is not that much of an issue
All in all, it is a good product by KWA and the price is amazing compared to all the features and performace this rifle provides.
by Casey P. on 03/07/2016
"Excellent EBB rifle by KWA.

The Good:
Upper breaks down easily - not like the old Magpul M4s. Easy barrel swaps for CQB/Field play. 380 FPS with the standard brass barrel, 320 with a crawler.
Electric recoil is unreal, this gun is the closest thing I've found to real steel in an M4 AEG.
Very cool lockback system when you use the magazines designed for the gun - the Magpul KWA magazines also work and makes using low caps fun as all get out.
Runs with standard M4 AEG magazines, which is nice.
Feels absolutely excellent in hand, metal where it should be, plastic where it should be.
Standard (real steel) Mil-spec handguard makes it easy to change out rail systems, I was able to fit a real steel carbine handguard on it (for test purposes)
Rear Wired, stock has room for ~1100 MAH stick 11.1v Lipo, or a 9.6v Nimh butterfly - the NIMH actually runs this gun!

The Bad:
It chews through batteries like nobodies business, I get less than half the shots out of my 11.1 1100MAH, ~550 rounds before the battery dies.
My 11.1 1100MAH only fits in the gun if I have the stock fully extended, so if you're a smaller guy/girl I advise buying smaller Lipos, and just bringing extra.
During breakdown of the rifle, it's incredibly easy to bend the "bolt" (just your standard hopup cover) lockback catch, which are two tiny little lips at the bottom of the bolt. When these are bent the lockback feature gets a bit wonky - that said, they're incredibly easy to bend back.
It's heavy.
It did not cook me breakfast when I woke up this morning.

KWA has made a great AEG here, and I'm glad I went with this one.
If you want a gun close to the real thing and don't want to do to much damage to your wallet, this is the one for you.

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This item is currently Out of Stock. Most out of stock items are restocked within 1-3 weeks. Some items may take longer. Please add this item to your wishlist to keep posted on its availability.