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BOLT B4 Knights Armament Official Licensed SR16 URX-3 2015 Enhanced B.R.S.S. Full Metal EBB Airsoft AEG Rifle - Black

ID: 52032 (AEG-B4-SR16-URX3-BK)
2.0 stars, based on 1 reviews
BOLT B4 Knights Armament Official Licensed SR16 URX-3 2015 Enhanced B.R.S.S. Full Metal EBB Airsoft AEG Rifle - Black
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BOLTKnight's Armament Airsoft


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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The Evike Epic Bonus Program is to reward you, our awesome customers, for shopping with us! Purchase of this item will qualify you for a free gift of your choice. ONLINE PURCHASES ONLY!
Canada Export CompliantCanadaExport Compliant
This gun has a muzzle velocity rating (FPS) between 366 and 500, and is compliant for export to Canada.
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BOLT B4 Knights Armament Official Licensed SR16 URX-3 2015 Enhanced B.R.S.S. Full Metal EBB Airsoft AEG Rifle - Black

BOLT 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 aluminum railed handguard, aluminum alloy upper and lower receiver, as well as all the familiar features of a traditional M4 / M16 weapons platform.


  • Knights Armament officially trademarked aluminum alloy receiver
  • CNC T6-6061 machined aluminum railed free float handguard
  • 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
  • Full length top rail for optics
Length: 813mm - 889mm, 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 PEQ box recommended (Wired to front w/ small Tamiya. Battery and PEQ Box 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.

1 Customer Review

(Write a review)

by Justin V. on 03/10/2015
"Between this. And the vfc. Being the only productiin sr-16 with correct lowers (not including trademarks)s. I chose this one due to the ebb/less work precived to get it running.

I am a skirmisher/airsmith, not just some guy that plinked down for a nice gun.

Out of the box i was rather impressed. Externals where about on par with g&p but noticed the finish on the urx3.1 rail scratches pretty easly.

Outside of externals. The ebb. It does accually kick. However. Not as hard as a gas in mag gbbr. (Feels harder then the erg, but not much). (Has nothing on my daytona gun fal)

On 9.6v batts the operation is sluggish. On 25c 11.1v its crisp but there is still room for improvement.

However. When accually shooting it...
Bbs hooked to the left badlly, and there was grease everywhere. Barrel, bucking, hop-up unit, and nozzle. And it wouldn't feed. Also was missing the steel flash hider, and spare wiring harness in mine. The hop-up chamber itself was missing one o-ring and had a miscut hop up nub. For $385.... Its pretty bad to have these quirks...... Not to mention not in the box. Shot okay after the degreasing of the chamber. Dropped the 6.0 barrel for a 6.03 tk twist. As mine was chronoing in at 347 fps on .2 out of the box. Now its a solid 200 foot gun.

Well... Almost. The bolt hi-torque motor is pretty much a wet ferrite motor. And pretty old tech. Going to replace with a neo magnet high torque.

Externals : 8/10
Internals: 5/10
Skirmishability 0/10 (10/10 after the rebuild)
Realism: looks good. Kick is good for an aeg 8/10

Would i buy one agian? Proboly not

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