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Home » Airsoft Guns » Gas Blowback Rifles

King Arms M4A1 Bullpup Gas Blowback Airsoft Rifle
(Color: Tan)

ID: 121831 (GR-KA-GBB-36-TN)
KA-GBB-36-TAN
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Optic not included
King Arms / Eagle ForceSRU

$429.00

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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Color Options:
ColorBlack
ColorOD Green
ColorTan

Description

Specs

Reviews

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Product Description

Features

  • Lightweight, durable polymer upper and lower receiver
  • Polymer handguard with laser etched trademarks allows for easy addition of any 20mm accessories
  • Rugged and lightweight nylon reinforced printed design
  • Flat top receiver makes mounting optics or other accessories easy
  • Pre-installed SRU bullpup conversion kit
  • Highly realistic gas blowback system mimics the manipulation of the real AR15 platform
  • Realistic fire controls with improved bolt locking lever
  • 50 round magazine, compatible with G&P and other Western Arms type magazines
The King Arms' first all-plastic GBB brings together innovation and performance in perfect harmony. This groundbreaking design, made from high-quality nylon fiber, offers exceptional durability and lightweight handling, making it the ideal choice for beginners.

Manufacturer: King Arms

FPS Range: 380-400

1 Customer Review

(Write a review)

by Chris C. on 12/09/2025
"i’ve owned this replica for about 3 months now and have fielded it every week since i got it, it’s a lot of fun and has a lot of recoil and has been really immersive to play with, it turns a lot of heads nobody has seen a bullpup m4 so if you want the attention. i was concerned at first with it having a polymer body and after 3 months of consistent use the thing is still super solid. i was also concerned at first because the nozzle doesn’t seal to the barrel nor go back and forth yet still has a spring to function like other gbbrs, yet it still works fine with full auto and shoots consistently at about 390-370 fps

pros:
solid construction
super good recoil
conversion kit super well designed
lightweight
locks back every time on empty (35 rnd magazines)
full length barrel in gun size of smg
consistent fps

cons:
king arms magazines have a bad rep for leaking
upgrade the hop nub (like with most guns)
polymer rail
fire selector in the conversion kit is a bit loose but you can just use the m4 fire selector in the back
you don’t own one yet

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King Arms / Eagle ForceSRU

About King Arms / Eagle Force

King Arms was founded in 2004 with the mission to ensure optimum customer satisfaction by providing precision products and outstanding service. In 2015, we moved our headquarters from Hong Kong to Taiwan where we've continued to provide excellent products with the highest quality. While working with leading firearms manufactures, we provide to our customers a level of innovation and authenticity that can't be found anywhere else in the Airsoft industry. This goal is what continuously drives us to improve and gives us purpose.