I purchased this upper in Jan13. It fits my S&W M&P AR 15 lower perfectly. It is very accurate,runs flawlessly with Golden Tiger,Wolf,WPA, S&P brass,PMC brass. It runs very clean. If that's not enough I hit an 8 inch gong at 565 yards! My buddy's AK struggled at 150yrds! It's well made and BR Arms is professional and delivered an excellent product.
Reviewed by: John from The Villages, FL.