bought this for my Newly Built AR-9 build, this went perfect into my Spartan Lower. The NIB trigger is a perfect fit. Great pull, consistent and crisp every time. Went thru 10+ mags (33Rnd SMG) without a hitch. Afterwards it cleaned up well with only a rag. All in all a great lower Parts Kit for a Fantastic price.
Reviewed by: Jason S. from San Antonio on 5/19/2019