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.
Backed by KA Tech Warranty
HPA Specialists Since 2022
Description

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.

Parts and accessories ship within 7 business days. Custom HPA rifle builds take up to 45 business days (often less). Need it sooner? Contact us to check current stock.

All sales on parts and accessories are final once shipped. Defective or damaged items are covered under the KA Tech Warranty.