The Micro Conversion Kit for the M&P Shield is the thinnest MCK we have ever produced due to the slim nature of the handgun itself. Featuring key advantages from our popular Gen2 platform the MCKSHIELD will come standard with a Gen2 stabilizer an aluminum top Picatinny rail and a magazine button catch/release for stronger retention on the extra mag holder of the MCK. - What is included in the Advanced Upgrade Kit: - Polymer-pair side rail thumb rests (MCKTHR) - Push button sling swivel (MCKPBSS) - One point sling (MCKOPS) - Flashlight that fits MCK (MCKFL) - Polymer front flip-up sight (MCKFBUS) - Polymer front rear-up sight (MCKRBUS)