The Calvin Elite Custom replacement trigger for the AR platform features a brand new internal design that rests in the proven and industry-defining Timney AR housing. It maintains an ultra-reliable 5-pound hammer spring coupled with a crisp and zero creep 1.5-pound pull. The reset is remarkable and notably one of the quickest and most tactile in the AR platform - allowing for rapid and precise follow up shots. The trigger comes with a total of four different shoes that include curved, flat, heeled, and knurled. All necessary tools for fitting and adjusting shoes are included as well. One key feature of the Calive Elite AR trigger are the fully-adjustable shoes for a custom fit for every user and application. The shoes are adjustable for length of pull, cast and height for the ultimate in custom comfort and positive contact. Additional shoes are available in a variety of color options as well. Triggers ship standard with red shoes.