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JP's MKIII system has a new and improved attachment method that combines great aesthetics and durability. It accommodates the stylish and rocky JP Signature tube, which boasts of a new textured finish, and moves rails fast. The MK III system allows for easy mounting of rails at any cardinal point along with the tube or at a 45° angle while still maintaining compatibility with all JP Tactical Rail accessories. The system is made to the uncompromising JP standard, fusing simplicity and utility while offering great benefits such as:

- A new, patented attachment method that enhances structural integrity while enabling perfect alignment to bore axis, like one-piece, monolithic systems.
- Top rail continuity that bridges receiver and hand guard rail with optical mounts.
- Easier and faster barrel installation or replacement enabled by a redesigned barrel nut.
- An internal barrel retainer nut that acts as a lifetime component that doesn't distort as one-piece, one-time-use aluminum retention nuts do.
- Easily interchangeable tubes that allow for rapid re-indexing.
- Standard and readily available 10-32 screws for rail attachment, which are less limiting compared to problematic proprietary hardware.
- Ergonomically optimal 2" tube diameter that easily clears minimized gas blocks and is available in small- and large-frame models.
- Fits AR-15/M16 pattern rifles.