The most popular Hinderer hardware upgrades are the bronze and blue titanium sets for the screws, pivots, and standoffs, right down to the lockbar stabilizer. For the 3.5" XM-18, that package is available as a complete kit that takes the guesswork out of the swap. Hardware is model specific, so match the set to your knife. You can find dedicated hardware for the Full Track, Half Track, Jurassic, MP-1, Maximus, and Eklipse.