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The JP MK III system now has an improved attachment method, combining both style and durability. It accommodates the rock-blasted JP Signature tube with its new textured finish, as well as providing easy rail mounting at the cardinal points and 45°s. The MK III system has been manufactured to the high JP standard and it fuses simplicity and utility, providing several benefits including:

- A new, patented attachment method that improves structural integrity and allows for perfect bore axis alignment comparable to one-piece, monolithic systems.
- Offers top rail continuity, allowing bridging of the receiver and hand guard rail with optical mounts.
- A redesigned barrel nut that allows for easier and faster barrel installation or replacement.
- An internal barrel retainer nut that serves as a lifetime component and doesn't distort like one-piece, one-time-use aluminum barrel retention nuts.
- Easily interchangeable tubes with rapid re-indexing.
- Standard, readily-available 10-32 screws for rail attachment, less limiting compared to proprietary hardware.
- Ergonomically optimal 2" tube diameter that easily clears minimized gas block and is available for both small- and large- frame models.
- Fits DPMS pattern 308 rifles.