One Piece Hop Up Chamber | SIG M17/M18 | TTI

TTI One Piece TDC Hop-Up Chamber – this one for your replica

This hop-up chamber is a CNC-machined upgrade part for GBB pistols, specifically designed for the SIG M17/M18 series. The hop-up unit determines how much backspin your BB receives during shooting, which directly affects your range and accuracy. By replacing your standard hop-up with this aluminium model, you achieve a more consistent BB trajectory and improved performance at longer distances. The TDC (Top Dead Center) system allows for more precise hop-up adjustment than traditional side-adjustment designs.

Technical specifications

The TTI hop-up chamber is fully manufactured from aluminium using CNC machining, ensuring tight tolerances and durability. The TDC adjustment system uses a screw on the top that applies direct pressure to the hop-up arm. This design eliminates play often found in standard hop-up units. The chamber is available in two colours: blue anodised and black anodised. The one-piece design means all components are integrated into a single solid unit.

Compatibility and application

This hop-up chamber is exclusively compatible with SIG AIR / VFC M17 and M18 GBB pistols. Installation requires disassembly of your pistol and replacement of the complete hop-up unit. Basic knowledge of GBB internals is required for installation – you must be able to remove and correctly reinstall the outer barrel assembly. The TDC system makes fine adjustment during skirms easier, as you only need to turn the top screw without having to remove the slide.

Ready to add the TTI One Piece TDC Hop-Up Chamber to your setup?