If you order the complete front sight, it includes all the necessary parts to install it and an extra roll pin in case you need a new one.  You will need roll pin punches to remove the old sight and to drive the roll pin back in and we don't include roll pin punches with the sight, but we do sell them separately.  We also sell replacement parts for the sight kit in case you need them.  The reticles are available separately in case you want to buy a sight along with a few other reticles at a lower price since you only need 1 full set of parts for each gun you want this sight on.   This is a modular system, so if you install 1 sight, you can then also change out reticles by hand in a few minutes without tools.  

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