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PolarStar JACK + MAXX MODEL alignment kit for SR25 DMR

24,00 €
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Version 2.5 of the hop-up alignment system, specifically designed for SR25 DMR HPA (Designated Marksman Rifle) replicas with a long V2.5 gearbox.

  • PolarStar JACK engine (compact HPA engine for AR-10/SR25 platforms with excellent response in DMR configurations).
  • MAXX MODEL chamber (high-precision hop-up chamber optimized for DMR builds using heavy BBs).

This kit ensures perfect alignment between the JACK nozzle and the MAXX MODEL chamber in long V2.5 gearboxes, eliminating play and improving consistency at the extended ranges typical of DMR builds. Compatible with ICS lowers and split systems for SR25 platforms.

Compatibility

Component Compatibility
HPA Engine PolarStar JACK SR25
Hop-up Chamber MAXX MODEL
Base Replica SR25 DMR
Gearbox Long V2.5 / ICS SPLIT

What the kit includes

  • Reinforced rear clip for mounting on a long V2.5 gearbox via rear pin or fixed stock.
  • Extended base with housing for M3 inserts (optional brass).
  • Side clip for routing the JACK HPA tube/line.
  • Front locking top cap optimized for the MAXX MODEL chamber in SR25 platforms.
  • Rear plate with mounting point for an M5 screw (extra reinforcement for DMR builds).

V2.5 adaptation: This kit features extended dimensions and specific reinforcements for long V2.5 SR25 gearboxes, maintaining the same alignment logic as V2.1 but with greater stability for heavy BBs (0.32g+).

Required components (not included)

  • 6× M3 × 4.2 mm inserts (one extra due to the long gearbox).
  • 6× M3 × 8 SHCS screws (additional reinforcement).
  • 1× M5 × 16 mm screw + washer (for the rear plate).