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BOLT Knight's Armament B4 SR16 URX3.1 Electric Recoil AEG - BLACK

SKU: TSI-B4SR16URX3R-120B BOLT AirsoftOut of stock

  • - Officially licensed by Knight’s Armament
  • - Built-in Bolt Recoil Shock System (BRSS)
  • - Full metal receivers and outer barrel
  • - Licensed CNC-machined URX3.1 rail system
  • - Full metal receiver and outer barrel
  • - Rotary wheel one-peice hop-up unit
  • - High torque airsoft AEG motor
  • - Ambidextrous magazine relief
  • - Ergonomic textured handguard and motor grip
  • - Flip-up front and rear iron sights
  • - Adjustable crane stock
  • - Steel flash hider included


BOLT Knight's Armament B4 SR16 URX3.1 Electric Recoil AEG - BLACK

The Bolt B4 SR16 URX3.1 AEG Rifle utilizes a patented Bolt Recoil Shock System (BRSS), providing shooters with realistic recoil behind every shot. Officially licensed by Knight’s Armament, the creators of the SR-25 and other Stoner Rifle variants, the Bolt SR16 AEG sports a precision inner barrel, high torque motor, and rotary wheel adjustment hop-up system. CNC-machined from a solid block of aircraft grade aluminum, an integrated (and licensed) URX3.1 rail system provides ample space for aftermarket upgrades. Three (3X) protective rail panels are also included to prevent the rails from digging into your hands, offering optimal gripping options. From the rifle length barrel to the buffer tube, this airsoft M4 rifle is made entirely of metal. If you’re looking to pick up an airsoft rifle that mirrors modern armament used by real-world operators, the Bolt Knight’s Armament B4 SR-16 Electric Recoil AEG is a prime pick.

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.

Battery Charger Recommendation: 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.

In the Box

Airsoft rifle

high capacity magazine

flash hider

3X rail panels instruction manual


Operation Electric Automatic
Build Metal Upper / Lower Receiver, Rail System, Mock Gas Block, Outer Barrel, Buffer Tube, Sights / Polymer Stock
Firing Modes Semi-automatic, Full-automatic, w/ Functional Safety
Muzzle Velocity 395 – 415 FPS (w/ 0.20g BBs)
Gearbox Full Metal Version 2 (w/ Bolt recoil system)
Magazine 300rd High Capacity (gear wind-up)
Battery 11.1V LiPo Nunchuck (not included)
Inner Barrel Length 363 mm
Hop-Up Adjustable
Weight 6 lbs
Overall Length 33.5" in. / 35" in. (Retracted / Extended)

California Proposition 65 Warning: Cancer and Reproductive Harm -

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