Refurbished
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle
Specna Arms Stubby Polarstar HPA M4 - KA Tech Airsoft - HPA Rifle

Specna Arms Stubby Polarstar HPA M4

$400.00
Engine

Which Polarstar HPA Engine Should You Choose?

All FPS figures are measured with our standard 180mm 6.02 inner barrel and KA Tech's tuned hop-up, bucking, and regulator combination.

Kythera

250–400 FPS · 350 FPS @ ~100 PSI · Semi-auto only

Purely mechanical — no electronics, no full-auto. Just air, BBs, and go, with a realistic trigger pull, break, and reset. Great for training, Milsim, or fields that are hesitant about HPA rifles.

Jack

250–410 FPS · 350 FPS @ ~100 PSI · Up to 50 RPS full-auto

Our entry-level HPA engine. Fast semi-auto with real full-auto capability.

F2

250–440 FPS · 350 FPS @ ~100 PSI · Up to 85 RPS full-auto

The best overall HPA engine on the market — the strongest combination of air efficiency, accuracy, range, consistency, and tune-ability.

Fusion Engine

250–500 FPS · 350 FPS @ ~55 PSI · Up to 75 RPS full-auto

The powerhouse. A clicky tactical trigger board delivers crisp trigger response for players who want the most power out of their rifle.

Our recommendation: First time going HPA? Go with the Fusion Engine. If you're committing real money to get into HPA, go all the way the first time so you're not stuck upgrading piece by piece down the road.

Made to order, ships in up to 45 business days

Trade in your rifle any time

Shipping & returns

Backed by KA Tech Warranty
HPA Specialists Since 2022

Specna Arms Stubby Polarstar HPA M4

A dependable workhorse setup, this build is Tried and True carbine with a stubby stock. The stubby stock keeps it compact and comfortable, making it a great do-it-all option.

Part of KA Tech’s Liquidation Sale: professionally built rifles with brand new HPA engines and refurbished bodies.

If you'd like to upgrade the hop-up, bucking, inner barrel, trigger, or IGL, we can do that before shipping the rifle.

All rifles come as shown. FCU, battery, airtank, regulator, airline, and magazines are sold separately.

Made to order. We build your airsoft rifle once you order it, so plan for up to 45 business days (most take less). Free shipping over $150.

Need it sooner? Contact us before ordering and we’ll tell you what’s in stock.

Trade in your rifle any time. See our Refund Policy. More in our Shipping Policy.

Every KA Tech airsoft rifle is backed by two layers of coverage:

  • Polarstar Manufacturer Warranty, 1 year, on your Polarstar components.
  • KA Tech Labor Warranty, 3 months. We cover 100% of the labor, you only pay for the replacement part.

Trade in your rifle at any time, for store credit or a cash refund. Like New: 70% store credit or 50% cash. Used at all: 60% store credit or 40% cash. Cancelling before it ships carries a 30% restocking fee.

Full terms on the warranty page, our Refund Policy and our Shipping Policy.

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