KA Tech x Gorilla x MAC Airsoft QCU Speed Soft Build Black Red - KA Tech Airsoft - Airsoft Rifle
KA Tech x Gorilla x MAC Airsoft QCU Speed Soft Build Black Red - KA Tech Airsoft - Airsoft Rifle
KA Tech x Gorilla x MAC Airsoft QCU Speed Soft Build Black Red - KA Tech Airsoft - Airsoft Rifle
KA Tech x Gorilla x MAC Airsoft QCU Speed Soft Build Black Red - KA Tech Airsoft - Airsoft Rifle

KA Tech MAC Polarstar Black Red QCU HPA M4

$2,000.00
Polarstar HPA 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.
Inner barrel length
Add Acetech Brighter C

Up to 45 business days

Production starts the moment you order. Cancel any time before it begins for a full refund — no fee.

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
Description

Every KA Tech rifle is built on internals and tuning we’ve spent the last four years perfecting. Our performance packages are the industry standard everyone else is chasing — if you want something that’s going to outperform everything else on the field, this is it.

The QCU (Quick Carbon Upper) is a premium, competition-ready HPA platform developed collaboratively by Gorilla Airsoft Technology and MAC Airsoft, then built and tuned by KA Tech. Engineered specifically for speedsoft and CQB, the QCU is favored for its ultralight carbon fiber construction, lightning-fast trigger response, and on-the-fly adjustability.

These custom builds feature a CNC-machined receiver and a proprietary TDC hop-up, and are compatible with HPA engines like the PolarStar F2 or Jack. Because they’re modular, you can extract the engine and fire control unit (FCU) in seconds without disassembling the entire gun.

Finished in a striking Black/Red colorway.

Colors, CNC design, and specific requests can always be customized — just reach out.

Buying a KA Tech rifle isn’t where our relationship ends — it’s where it starts. Think of us as the best HPA technicians in the country, in your pocket, 24/7. Want to change your FCU tune? Swap parts? God forbid something goes wrong? We want to be the first call you make for anything HPA-related. When you buy a KA Tech rifle, you’re not just getting the best build on the field — you’ve got a full tech team behind every move you make.

  • Ultralight carbon fiber construction
  • Cerakoted for an extremely durable, field-ready finish
  • CNC-machined receiver
  • Modular design — extract the engine and FCU in seconds, no full disassembly required
  • Built-in Speed Cannon barrel for a cleaner, more streamlined front end
  • Built for extreme range, accuracy, and consistency
  • Compatible with M4-style magazines
  • Tuned and tested with PTS EPM1 magazines and precision .25g BBs

Internal Parts

  • HPA Engine Options: Polarstar F2 or Jack
  • FCU: Fully tuned Polarstar FCU
  • Hop-Up: Proprietary TDC hop-up unit
  • Nub: TDC Flathop
  • Bucking: Hot Shot 60
  • Inner Barrel: Crazy Jet
  • Regulator: KA Tech Edition Polarstar MR2 Regulator
  • Battery: Sold separately

Performance

  • F2 reference spec: 350 FPS @ ~100 PSI, 250-440 FPS adjustable range, up to 85 RPS full-auto
  • Jack reference spec: 350 FPS @ ~100 PSI, 250-410 FPS adjustable range, up to 50 RPS full-auto
  • Firing Modes: Semi / Full-Auto

External Parts

  • Receiver: QCU (Quick Carbon Upper), CNC-machined, carbon fiber
  • Trigger: Speed trigger
  • Barrel: Built-in Speed Cannon (not swappable to standard)
  • Magazine: M4-style (not included)
  • Production: Built to order — begins immediately upon purchase
  • Estimated Ship Time: Up to 45 business days (often less)
  • Need It Faster: Contact us to check current in-stock availability
  • Delayed Orders: If we can't meet this window, you may cancel for a full refund — no fee
  • Polarstar Manufacturer Warranty: 1 year on Polarstar components (engine, regulator, etc.)
  • KA Tech Labor Warranty: 3 months, 100% labor covered — you only pay for parts
  • Warranty Activation: Requires watching our 2-minute HPA do's & don'ts video
  • Cancellations: Accepted any time before shipping; 30% restocking fee applies once production has begun
  • Trade-Ins: 70% store credit / 50% cash refund if like-new, 60% store credit / 40% cash refund if used