Delivery before X-MAS only for orders received by December 17, 2025.

RetroArms CNC Hop-up Chamber AR15 BASIC - Black

CNC Hop-Up Chamber AR15 BASIC by RetroArms in black.

Designed for AEG AR15 rifles (M4, MK18, M16, SR-25, and others).

Made from aircraft-grade aluminum EN AW 7075.

Ready for R-Hop and standard buckings.

Collet nut ensures perfect barrel centering and stability during firing.

O-ring in the chamber inlet prevents BBs from falling out during reloads.

Easy installation with no tuning required.

Další varianty

  • Black
    Out stock

41,85 € tax incl.

Availability: In Stock at store

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Accessories

  • 31,70 € In Stock

    : Maple Leaf

    MPLF005

    Precision Inner Barrel for AEG by Maple Leaf with a diameter of 6.02 mm. Length of 370 mm (M4, MK18 BLOCK 2, HK416D, SCAR-H, M249, MK46 and other models). Increases performance, range and accuracy. Compatible with AEG guns of TM (Tokyo Marui) standard. Barrel cutouts for both AEG and GBB / VSR hop-up chambers. AEG variant with bridge.

    31,70 €
    Out of stock
    Ask without obligation
    Pre-order with unknown delivery date.
  • 12,26 € In Stock

    : 4UAD SmartAirsoft

    4UAD001

    High-quality 4UANTUM Friction hop-up bucking by 4UAD for AEG / HPA rifles. Redesigned nub for perfect range and accuracy. Capable of hop-up for heavy sniper BBs up to 0.48g. Traditional single-point nub with minimal room for BB misalignment. Accuracy, range, and precision, that’s what it’s all about!

    12,26 €
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CNC Hop-Up Chamber AR15 BASIC by RetroArms

The AR15 BASIC hop-up chamber is a high-performance unit from Czech manufacturer RetroArms, designed for AEG replicas based on the AR15/M4 platform. The body is precision CNC-machined from EN AW 7075 aluminum. The chamber inlet features an O-ring that prevents BBs from falling out during reloads. The collet nut ensures barrel centering and eliminates unwanted movement, regardless of the outer barrel diameter (compatible with 8.4–8.5 mm barrels). The BASIC version is the easiest to install, requiring no adjustment to nozzle length or gearbox alignment. It’s also fully compatible with most hop-up buckings.

Comparison of BASIC, PRO, and ULTRA Hop-Up Chamber Models

  1. BASIC
    Perfect for users seeking a reliable and accurate chamber without fine-tuning. CNC-machined from EN AW 7075, features an O-ring to prevent BB drop and a collet nut for barrel centering. Ready for R-hop and compatible with most buckings and barrels. Excellent performance-to-price ratio and simple installation.

  2. PRO
    Based on the BASIC model but adds an adjustable magazine well height in 0.2 mm increments, improving magazine compatibility in some AR15 setups. Includes the same collet nut, O-ring, and CNC construction. Ideal for users who need precision and consistent feeding even with tricky mags.

  3. ULTRA
    For demanding players seeking a fully tunable chamber. Adds longitudinal adjustment relative to the gearbox. Features an enhanced barrel locking system with a POM lock and clamping nut to eliminate movement. Also includes a flat, extended bucking channel ready for ROBUST no-lip buckings. ULTRA is the most advanced model in RetroArms’ lineup.

Key Features

  • Durable EN AW 7075 construction
    Maximum strength and precision thanks to CNC machining.

  • Collet nut for barrel centering
    Prevents barrel movement and improves shooting consistency.

  • O-ring in chamber inlet
    Prevents BBs from falling out during reloads.

  • Improved compatibility
    Works with most hop-up buckings and 8.4–8.5 mm inner barrels.

Technical Specifications

  • Material: Aircraft-grade aluminum EN AW 7075 (CNC machined)
  • Chamber type: AEG for AR15/M4
  • Chamber inlet: With O-ring
  • Barrel locking: Collet nut (for 8.4–8.5 mm barrels)
  • Compatibility: Tokyo Marui AEG standard (most hop-up buckings)

Package Contents

  • CNC Hop-Up Chamber AR15 BASIC
  • Collet nut
ColorBlack
Hop-Up chamber materialMetal