This advanced kit is designed for firearm enthusiasts seeking to enhance their equipment, but it requires professional installation or inspection by a qualified gunsmith to ensure optimal performance and safety. It is important to note that EGW hammers are sensitive to certain coating processes, particularly those involving heat. Such processes can compromise the integrity of the hammer, making it brittle and prone to fractures. While some coatings, like Robar's NP3, are compatible, it is crucial to consult with the coating provider to confirm that their method is safe for heat treated components. Please be aware that applying inappropriate coatings to the hammer will void the warranty. Prioritize safety and performance by adhering to these guidelines for a reliable and durable upgrade. The kit comprises an HD hard sear, an HD stainless steel lightened hammer, a ball head disconnector, an evolved sear spring and a 19 lb ISMI main spring