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Weapon Shield 90

  • EXTENDED Industry Leading 90 Day parts and defects warranty
  • Covers for all repair work
  • Comprehensive Tech Support
  • Priority processing time, Ships within 1 business days
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$9.99
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Weapon Shield Extended 135

  • TRIPLE EXTENDED Industry Leading 135 Day parts and defects warranty
  • Covers for all repair work
  • Comprehensive Tech Support
  • Priority processing time, Ships within 1 business days
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+ Tech Inspection

  • FPS Chronograph Certification
  • Gearbox Cleaning
  • Gearbox Lubrication
  • Fuse Replacement
$19.99
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AMS Standard 45

  • Industry Leading 45 Day parts and defects warranty
  • Covers for all repair work
  • Comprehensive Tech Support
  • Standard processing time, 1-2 business days
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AMS Proshop Warranty Options

Airsoft Megastore is proud offer our customers the most comprehensive warranty options in the industry. Orders are processed within our standard 1-2 business days from the date of purchase and shipped out with your selected shipping method (chosen at checkout). All accessories and upgrade parts are shipped within their manufacturer's packaging, to best protect each part during shipping. Upon arrival, the player will need to easily attach their own parts. Please be careful not to void your warranty by opening your gearbox, or damaging any of the accessories, as they are not covered under any warranty.

We suggest that anyone investing in a gun from our custom proshop purchase a weapon shield protection plan. There's no sense in spending your hard earned cash on something this awesome and then be at the mercy of the manufacturer's limited parts warranty. Purchase a weapon shield plan, 90 or 135 day plans to protect your airsoft investment. Our 135 day plan includes an inhouse tech service that you have 135 days to use. Our techs will do a clean up that should keep your airsoft investment running like the day you got it. All Weapon shield customers are prioritized for order processing as well as other services. Join the our satisfied Weapon Shield customers today!

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420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox

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  • Model: M4
  • Muzzle Velocity: 420 FPS
  • Build Material: Metal Receiver, Barrel
  • Weight: 6.25 lbs
  • Overall Length: 29.5" in. / 33" in.
  • Inner Barrel: 363 mm
  • Battery Type: 9.6V Mini
  • Gearbox: Version 2 (Metal)
  • Magazine Capacity: 300 rounds
  • Color: Black
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Must Haves

BBsExtra MagazinesFace & Eye ProtectionGun BagPremium BatteriesSmart Charger for AEGsTactical Protective GlovesUniversal Tactical Sling

Tactical Gear

Tactical Vests

Upgrades and Add-Ons

Flashlights & LasersScopes and OpticsTactical Foregrips


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  • Ratings & Reviews
HOLIDAY SALE: Get 25% off this product (and more) by using code 25SANTA while supplies last! Limited quantities available for this item at this price. Excludes MAP and sale items.

Our take:  The NEW A&K Full Metal M4A1 Carbine AEG is part of A&K's new line of completely redesigned, performance oriented, metal body AEGs. These NEW A&K AEGs are built to the same performance standards as other top tier airsoft guns costing nearly twice as much.  These A&K AEGs not only feature top of the line performance in a durable metal body, but also include everything you will need to start using the rifle! The A&K M4A1 Carbine includes a 9.6v battery, a standard wall charger, a 300rd high capacity metal magazine (feel free to go for the A&K 5000-round M4 AEG Magazine Box), and a metal replacement flash hider! The M4A1 Carbine AEG packs a huge punch in a maneuverable and compact size, shooting consistently over 400 FPS! The M4A1 Carbine AEG is sure to pick off the opposition at extreme distances!

The M4A1 Carbine features a fully adjustable 6 position LE stock, making this AEG more maneuverable and well adapted for close quarters combat. This M4A1 Carbine AEG can also easily hold its own in an outdoor environment. With a precision inner barrel and fully adjustable hop-up, it can easily hit targets beyond 150 feet! The M4A1 Carbine AEG features a full metal upper and lower receiver, a full metal outer barrel, full metal front and rear iron sights, and full metal top rail. The only plastic components on the rifle are the retractable stock, textured hand guard, carrying handle, and the motor grip. The A&K M4A1 Carbine's construction is extremely durable, and has a realistic weight and feel.

The new A&K Full Metal Body M4A1 Carbine has a redesigned and reinforced metal gearbox with a factory installed M120 spring (Airsoft Megastore also carries aftermarket springs like the SHS X-Mod M120 Gearbox Spring), making it one of the hardest hitting stock, metal body AEGs on the market! The full metal gearbox features metal bushings, a metal ball bearing spring guide, a full steel gear set, a high torque motor, and a perfectly sealed cylinder. The A&K M4A1 Carbine also features a full metal hop-up unit as well as a 6.04mm precision inner barrel, providing excellent range and accuracy. The M4A1 Carbine can easily hit targets at over 150 feet away!  

Overall, the A&K Full Metal M4A1 Carbine AEG is one of the best metal body M4's on the market, under $250. With solidly constructed full metal externals and a reinforced high performance gearbox, this AEG is able to hold its own against some of its top tier AEG competitors. The A&K M4A1 Carbine AEG provides great accuracy and hard hitting power in a compact size. If you are looking for a top performing full metal AEG, but can't afford the top tier price tag this is definitely the AEG for you!

Features:
- Metal body (full metal upper & lower receiver)
- High performance/ High Torque full metal gearbox and motor
- 300rd Metal high capacity magazine included
- Realistic weight and feel
- Top rail for optics and accessories
- Extremely hard hitting (Shoots over 400FPS!)
- Extremely durable
- Ready to go out of the box!

Specifications:
Operation:  Electric Automatic
Build/Body:  Full Metal Upper & Lower Receiver, Barrel and Buffer Tube
Gearbox:  Full Metal Version 2 Gearbox
Firing Modes:  Semi-automatic; Fully Automatic
Overall Length:  29.5" in; 33” in. (Retracted/ Extended)
Outer Barrel Length: 14.5” in.
Inner Barrel Length:  363mm
Inner Barrel Diameter:  6.05mm
Hop-Up:  One Piece Adjustable
Magazine Capacity: 300rd High Capacity magazine
Caliber:  6mm Airsoft BB
Muzzle Velocity:  380-420 FPS (w/ 0.20g BBs)
Rate of Fire:  13+ RPS (Rounds per Second w/ 9.6v Battery)
Weight:  6.25 lbs.
Power:  9.6V NiMh Mini Battery

Ammo type:  Seamless 0.20g or heavier (0.23g, 0.25g, 0.26g, 0.28g, etc) BBs. For maximum performance and accuracy, Airsoft Megastore recommends GoldenBall ProSlick BBs which carry perfect spherical consistency and density, available at Airsoft Megastore for the lowest price on the market, guaranteed.

Package includes:  A&K M4A1 Carbine, 300rd metal hi-cap magazine, 9.6v 1200mah mini battery, standard wall charger, and cleaning rod

Battery Charger Recommendation:  Although this fully automatic airsoft rifle comes with a standard wall charger to charge the battery, Airsoft Megastore recommends the use of a smart charger to avoid overcharging the battery(overcharged batteries may cause decreased airsoft gun performance and may shorten battery life significantly).  Smart chargers not only shorten charge time significantly (up to 800% faster charging), but more importantly,also automatically shut off once the battery is fully charged to avoid overcharged batteries.




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Overview

***** 4 / 5
Based on 18 Review(s)
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Product Reviews

5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Awesome gun

"Got this gun is awesome shoots freaking hard I used it in a war and kicked but thanks airsoft megastore"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
RAD

"

got this gun as a back up weapon and have now switched to this gun as my primary weapon. was running with the JG M4 s system but this gun is lighter and feels better. Added a new front RIS system and a red dot and also switched out the piston (metal) and piston head, this gun is now far better than my JG. FPS is good and accuracy is great. Great price for a great gun. Get this gun!!!!!!!!!!!!!!!!!
 
AMS CS: 
Hey! Thank you for the review. Check out the AMA 7-INTENSITY AIRSOFT RED DOT SCOPE!
"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
to the guy who said gun doesn't shoot

"try cleaning your barrel or unjamming the problem it could also be is the your using crap BBs that will make you mage not feed even though you've winded it they also break in your gun and can cause you to have broken gears because the little tiny pieces will find their way in you gear box so, i personally recommend that you buy Golden Ball .20g pro slick seamless bbs and also if your bbs have a line down the middle that means that their crap cause they were forged together and will break and if you can't see the seam i recommend that you put a couple bbs on some tape and fold the tape fat style and hit them with a hammer if they crush like crazy in 4-5 hits their crap this might not be the problem but that is just some suggestions"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Awesome gun!

"Allright, let me start off by saying I got this 2 days ago and played with it yesterday, when I got there they told me let:s chrono it. When we did it it was 404,25 fps with 0.25 g bb's. I don't use 0.20 g bb's because it goes sometimes with the wind but it shoot so fast even with the 0.25 g bb's. So let me just say I recommend you buy this gun"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Good Gun

"Pros This gun is great all around it shoots really hard and accurate and its very solid. Cons The way you have to put in the battery is hard at first but i got it now and the orange tip of the gun it a cheap plastic and my sling didn't want to hold my gun at one point and the tip shattered."

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Amazing

"This is a great hard hitting gun. It is very sturdy, fast, and accurate. The battery is a little tricky to get in but once you do it a few times it gets easier. This gun is very accurate, I shot a 3 inch pole about 150 ft. away from where I was shooting. I recommend this gun to anyone looking to have fun outdoor battles!"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
pretty frickin good

"When i first opened the box, i stared in awe. It is a beautiful gun. Very fast and hard hitting. My only complaint is the battery. It is so hard to put the battery into the underbarrel(at least for me). I personaly modified my gun to where the battery is on the outside. But overall if you are looking for a sturdy, fast shooting, reliable gun, this is the gun for you!"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
pretty frickin good

"When i first opened the box, i stared in awe. It is a beautiful gun. Very fast and hard hitting. My only complaint is the battery. It is so hard to put the battery into the underbarrel(at least for me). I personaly modified my gun to where the battery is on the outside. But overall if you are looking for a sturdy, fast shooting, reliable gun, this is the gun for you!"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
awesome

"this is a great sturdy gun i love it buy buy buy"

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5 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Amazing

"This gun is so powerful at 420 fps and it shoots really fast my friends are going to be really scared of this gun when I show them this. It is amazing."

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4 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Pretty good

"So, an honest review. The gun out of the box was decent. Everything working alright. The battery was a little tough but after practicing putting it in, I got better at it. The gun was shooting pretty fast and the battery was holding charge well. And then... it stopped shooting. The trigger was hard to pull and was making a loud clicking noise. I was working then not working. All in all.. hopefully it gets fixed. Pros: `Full metal `Good rof `Good fps `Sturdy `Comes with battery and charger `Accurate Cons: `Trigger feels wierd `The included mag makes it jam `Jams with other mags also `Battery is a pain `No rails"

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4 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
Awesome with upgrades

"This gun is amazing. It shoots at 430 - 435 fps with .20g bbs. The only reason this is four stars is the handle for adjusting the stock fell off. Although it is still very usable, I would recommend getting upgrades for this gun if you a serious airsofter. The two plastic pieces, the stock and the handguard are the only things I upgraded. The internals of this gun are rock-solid, I have been using this gun for a while now, and it has only malfunctioned once, and even that was easily fixed. It has even shot some .12g bbs with no trouble! Overall - GET THIS GUN 4.75 Stars"

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4 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
4 and a half

"This was my second air soft gun and let me say im glad to get it. I originally used a gun i found at wal mart and decided id find a better gun. This Gun is excellent shoots fast and is great let me mention it also goes on sale all the time so that's great. It doesn't shoot quite 420 but it is close enough. My only complaint is it when i took it into battle it had a gear problem but it was easily fixed by a small adjustment."

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4 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
best gun yet

"This is my 4th AEG, and best yet. Durable, accurate, balanced, and hard hitting. 405 fps with .23 bbs. I wanted to purchase a couple more as gifts for family members, but no longer in stock. The stock 9.6v battery inspires confidence. I hope they get more in stock soon. If the battery was easier to access for charging I would give it five stars. "

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3 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
true Review

"When i first got it i was super happy i charged the battery four hours then struggled for 20 minutes to put the battery in then put the extra D Boys mag that doesn't work. Then put the mag it cam with in then fired and i was amazed it punched right through a ice cream pale but then i fired a again. nothing it didn't fire it miss fired then i tried again same results the next day i tried figure it out then realized there was some thing i hadn't seen the hop up lever it was completely broken i pulled it out and it came the whole thing i sent it back the next hope when the next one comes it will work. But it has great ROF and FPS it would be boss if it had worked so over all im disappointed but iguess i just got a bad gun not AMS fault the whole thing is metal except the part you put the battery in."

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3 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
true Review

"When i first got it i was super happy i charged the battery four hours then struggled for 20 minutes to put the battery in then put the extra D Boys mag that doesn't work. Then put the mag it cam with in then fired and i was amazed it punched right through a ice cream pale but then i fired a again. nothing it didn't fire it miss fired then i tried again same results the next day i tried figure it out then realized there was some thing i hadn't seen the hop up lever it was completely broken i pulled it out and it came the whole thing i sent it back the next hope when the next one comes it will work. But it has great ROF and FPS it would be boss if it had worked so over all im disappointed but iguess i just got a bad gun not AMS fault the whole thing is metal except the part you put the battery in."

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3 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
true Review

"When i first got it i was super happy i charged the battery four hours then struggled for 20 minutes to put the battery in then put the extra D Boys mag that doesn't work. Then put the mag it cam with in then fired and i was amazed it punched right through a ice cream pale but then i fired a again. nothing it didn't fire it miss fired then i tried again same results the next day i tried figure it out then realized there was some thing i hadn't seen the hop up lever it was completely broken i pulled it out and it came the whole thing i sent it back the next hope when the next one comes it will work. But it has great ROF and FPS it would be boss if it had worked so over all im disappointed but iguess i just got a bad gun not AMS fault the whole thing is metal except the part you put the battery in."

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2 420 FPS A&K Full Metal Airsoft M4A1 Carbine AEG - Full Metal Gearbox *****
gun doesn't shoot

"I ordered this gun and opened the box and charged the battery for then gun and then tried to shoot it. But all the gun does is feed the bbs and not shoot"

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Great customer service, really worked with me.
The rifle I purchased came unable to work, I was able to send the item back and they sent me a band new one with no cost me. Also, their tech service was great as well!! Jasoncampbell, USA
Great customer service, really worked with me.
The rifle I purchased came unable to work, I was able to send the item back and they sent me a band new one with no cost me. Also, their tech service was great as well!! Jasoncampbell, USA
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The gunbuilder was very useful and made it easy for me to buy my first mid/high spec gun for just about $300. It gave me comfort in that i can get more parts to switch out at a later time if i wish to change anything about my rifle and that there will be compatible parts for any modifications i choose to do on it. The gun came in full working order and the hopup was even adjusted to be perfect right out of the box. I could easily hit targets over 150ft away constantly. Johnmstopka, USA
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Every time I purchase from Airsoft Megastore I am very satisfied with my order. It arrives on time and the deals are excellent. AMS is probably my go to place for airsofting equipment, especially when I'm itching to add another gun to my collection! macawilliams12, USA
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