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BOLT B4 13" KeyMod 2015 Enhanced Railed B.R.S.S. Full Metal EBB Airsoft AEG Rifle (Color: Black / Tan)

ID: 52029 (AEG-B4K-120-T)
5.0 stars, based on 2 reviews
BOLT B4 13 KeyMod 2015 Enhanced Railed B.R.S.S. Full Metal EBB Airsoft AEG Rifle (Color: Black / Tan)
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Optic shown in images not included

$359.00 $261.00

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.
Optic shown in images not includedBOLT Airsoft's B4 Enhanced AEG features their Bolt Recoil Shock System (B.R.S.S.) to create simulated recoil for enhanced realism. In addition to the recoil system, BOLT has also greatly reinforced the gearbox and the rest of the internals to withstand the powerful recoil shock and to enhance the rifles durability and performance. Externally the rifle features a tactical CNC machined KeyMod aluminum railed handguard, aluminum alloy upper and lower receiver, as well as all the familiar features of a traditional M4 / M16 weapons platform.


  • High strength aluminum alloy receiver
  • CNC KeyMod machined aluminum railed free float handguard
  • Enhanced target acquisition modular fore grip system
  • Realistic recoil feedback from the BRSS recoil system
  • Reinforced gearbox with heavy duty internal parts
  • BOLT steel enhanced gearset
  • CNC lightweight aluminum full tooth piston & piston head
  • High torque motor
  • Aluminum tightbore inner barrel
  • M4 style pistol grip
  • Adjustable stock
  • Removable front and rear sights
  • Laser etched trademarks
  • Full length top rail for optics
Length: 813mm - 895mm, Adjustable
Weight: 3600g
Magazine Capacity: 300rd Hi-Cap. Works with Tokyo Marui, Matrix, G&P and other compatible M4 Series Airsoft AEG Magazines
Muzzle Velocity: 385-395 FPS (Measured with 0.20g BBs)
Gearbox: Ver 2 Full Metal, Fully Upgradeable
Motor: Long Type
Fire Modes: Semi/Full-Auto, Safety
Package Includes: Gun, Magazine, Vertical Grip
Battery: 7.4v / 9.6v Butterfly Type Battery Recommended (Wired to rear w/ small Tamiya. Battery not included)
Hopup: Yes, Adjustable

Manufacturer: BOLT Airsoft

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.

FPS Range: 385-395

About BOLT

Bolt Airsoft excels in bringing realism to the Electric Airsoft rifle market through their patent pending Bolt Recoil Shock System (B.R.S.S. for short.) Their goal is to combine the advantages AEGs have such as performance, consistency, and reliability with the often sought after recoil impulse from a gas blowback system. This unique feature works by transferring the kinetic energy from the piston cycling to a weight system in the stock to generate the simulated recoil. Paired with high quality externals, Bolt Airsoft offers a line of excellent ready-to-play guns that also make for great starting platforms for project guns and upgrades.

California residents click here for Proposition 65 warning

2 Customer Reviews

(Write a review)

by jordan b. on 07/27/2017
"This gun with amazing i highly recommend this gun. perfect for milsim, sadly my fake bolt broke but the ebr is still working great.

shoots 336 with .25
recoil is intense
rps is fast

motor heats (every motor does)
my fake bolt broke
about 13 pounds

Overall i fell in love with this thing from the start.Very good gun for high end airsofters
by Joshua B. on 03/23/2016
"This gun is very nice. Well put together even the B.R.S.S system is very nice when the I pull the trigger it is responsive in the recoil. The trigger pull is nice and crisp and the delay is just slightly there but barely enough to even notice it. One problem I did have with it was putting the rounds through to fast on semi-auto can lock up the trigger, but this was a easily over come by just switching the firing to full and back to semi helped it. The internals on the gun are well put together and all easily accessible, plus you have a full metal besides the stock. Another downside I had was the butterfly 9.6V battery has a very very tiny space it is a little difficult to put the battery in and the back on.

Pro: Electric recoil system nice
Trigger is crisp
Rifle is built well
Nice internals
Hop up is easily accessible
Fully metal unless you want a lighter weight gun

Cons: The trigger has tiny delay
The trigger issue
Barely any battery space for 9.6V butterfly

Besides all of that the gun is nice and I would definitely recommend it to almost anyone who is looking for a good new AEG to try.

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