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

ID: 51532 (AEG-B4Key-R-120B)
5.0 stars, based on 2 reviews
BOLT B4 13 KeyMod 2015 Enhanced Railed B.R.S.S. EBB Airsoft AEG Rifle (Color: Black)
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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.
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Canada Export CompliantCanadaExport Compliant
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.
BOLT Airsoft brings the realism of recoil feedback to the AEG market through their patent pending Bolt Recoil Shock System (BRSS for short). The BRSS design provides an extremely authentic kick providing the user with extremely realistic feedback. The BRSS design rivals many Gas Blowback rifles currently available.


  • Realistic recoil feedback from the patent pending BRSS system
  • Modular Keymod front end for tactical accessories
  • 2x Rubber handguard covers included
  • Polymer low profile handstop included
  • Full metal receiver and barrel assembly
  • Flat top Picatinny rail for optics
  • Detachable front and rear flip up sights
  • Retractable crane stock
  • Mock bolt with realistic blowback
  • Compatible with standard Ver.2 parts
  • Reinforced gearbox with heavy duty internal parts
  • CNC stainless steel spur gear
  • CNC aluminum piston set (w/ full steel tooth)
  • High torque motor
  • Aluminum alloy 6.01mm tightbore inner barrel
Length: 810mm-895mm, Adjustable
Weight: 3020g
Inner Barrel: 363mm
Magazine Capacity: 300rd Hi-Capacity. Works with Matrix, G&G, Tokyo Marui and other compatible M4 / M16 Series Airsoft AEG Magazines
Muzzle Velocity: 380~400 FPS (Measured with 0.20g BBs)
Thread Direction: 14mm Negative
Gearbox: Ver 2 Full Metal, Fully Upgradeable
Motor: Long Type
Fire Modes: Semi/Full-Auto, Safety
Battery: 7.4v / 9.6v Butterfly Type Battery Recommended (Wired to rear w/ small Tamiya. Battery and PEQ Box not included)
Hopup: Yes, Adjustable
Package Includes: Gun, Magazine, Manual

Manufacturer: BOLT

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: 380-400

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.

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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