NP1050 Nipple - 5/16 X 18 Ampco

The nipples sent (for original Enfield) were .315dia. -- 5/16 is .3125 and the actual thread dia. on a 5/16 is about .309 because threads are rounded at the crest - and so .315 will not fit. The threads were also not undercut as clearly shown in the picture of NP1050 in the website catalogue and thus the nipples (after being re cut to correct thread size ) were unable to sit flush. In short I was sent the wrong nipples but Dixie will not acknowledge their mistake.