Bought this because I got the WBP Jack, but did not want to mess up the original bolt carrier when installing the KNS piston. I will say that it was definitely worth the cost. Just dropped in and ran with no issues. Installing the piston was also super easy. I give this purchase 5/5 Mark Ruffalos!
I replaced my cast carrier for this one. Couldn’t be happier with the product. Fit just fine with my KNS piston.
Love WBP products, have several of their carriers always high quality.
Used this with a KNS adjustable gas piston for my overgassed WBP Jack SC. Worked great, no problems after 200 rds. Clean machining and pretty smooth even finish.