Double Star uses only the best parts to make their lower parts kits. The fire control group is made from mil spec heat treated 8620 steel and finished on all touch points for a smooth, crisp trigger pull with minimal creep or drag. This AR15 lower parts kit uses high quality American made parts to ensure performance in your AR15.Features :Includes an additional takedown detent and springCoiled steel spring pinsCrisp trigger pull with minimal creep or drag