Rossi M4 Sentinel BETA (Black)

Construction & Aesthetics

• Polymer Build: Both upper and lower receivers, along with the handguard, are made from durable polymer—keeping weight low while retaining robustness

• Handguard Design: Features a 9″ polymer handguard with Picatinny rails on all four sides, styled after Daniel Defence — ideal for mounting a wide range of accessories

• Metal Components: Externally, high-wear parts like flash hider, fire selector, mag release, sling point and sights are metal—delivering durability in key areas

Gearbox & Internals

• Version 2 Gearbox packed with quality components:

  • 18:1 steel gearset

  • Steel-tooth piston (14.5 teeth)

  • 8 mm bearing bushings

  • Quick-change (QD) spring guide

• Trigger System: Equipped with ETU (Ver.1) featuring active brake and MOSFET protection, enabling crisp semi/full-auto firing

• Barrel & Hop-Up: 6.02 mm precision inner barrel (~260 mm long) paired with a rotary hop-up for quick accuracy adjustments

• Performance: Produces around 310 fps with 0.20 g BBs—suitable for most UK field limits

Handling & Ergonomics

• Length & Weight: Compact CQB-oriented profile—length adjusts from ~700 to 780 mm; weight sits about 2.2 kg—balanced and maneuverable

• Stock & Sights: Adjustable crane-style stock and low-profile flip-up sights included for versatile field use

• Battery Setup: Standard mini-Tamiya connector; 7.4 V LiPo recommended (not included)

Extras & Magazines

• Magazine: Ships with a 300-round polymer hi-cap magazine

• Quick Spring Change: QD system allows fast compliance with field FPS regulations

Quick Reference Table