Improve your grip, maximize your sight and stability with the Stage 1 Laser Upgrade Kit. This Advanced Upgrade Kit is designed for and fits the latest Micro Roni Kit – the Micro Conversion Kit (MCK), as well as previous Micro Roni models for Glock 17 and 19. With all products included in the Stage 1 Laser Upgrade Kit, you can now upgrade your MCK, Micro Roni 17 OR Micro Roni 19 into an Advanced MCK, Advanced Micro Roni 17 OR Advanced Micro Roni 19.