KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle
KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle
KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle
KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle
KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle
KA Tech HK416 HPA M4 - KA Tech Airsoft - Airsoft HPA Rifle

KA Tech HK416 HPA M4

$1,150.00
Polarstar HPA Engines

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
Trade in anytime — up to 70% back in store credit
3-month labor warranty — you only pay for parts

KA Tech HK416 HPA M4 from KA Tech.

  • HPA-ready/custom configured airsoft platform.
  • HK416-style M4 build.
  • Built, Tuned, Perfected by KA Tech
  • Battery, tank, regulator, line, magazines, and accessories are sold separately

Internal Parts

  • HPA Engine: PolarStar Kythera, Jack, F2 or Fusion Engine
  • Hop-Up Chamber: Maxx Model CNC Aluminum Hop-Up Chamber — M4E Pro or M4G GBB
  • Bucking: Maple Leaf Autobot Hop-Up Bucking or Maple Leaf SUPER Macron Hop-Up Bucking
  • Inner Barrel: Maple Leaf 6.02mm Airsoft AEG Tightbore Inner Barrel or Maple Leaf Crazy Jet Inner Barrel 6.02
  • Internal Airline: Amped IGL Internal Airline – Standard — JACK™ / F2™ / Black

External Parts

  • Trigger: Speed Airsoft HPA M4 Tunable Trigger — Blade / Black

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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