Philip W. Comfort, A Commentary on the Manuscripts and Text of the New Testament (Grand Rapids: Kregel, 2014). 416 pp. $30. May be purchased here.
"An up-to-date commentary on all the significant manuscripts and textual variants of the New Testament.
This small and insightful volume is an essential resource for the committed student of Greek New Testament. Using the same trim size as UBS and NA28 Greek New Testaments, this reference commentary, based on the latest research, is designed to aid the reader in understanding the textual reliability, variants, and translation issues for each passage in the New Testament.
Unlike any other commentary, this volume contains commentary on actual manuscripts rather than a single version of the Greek New Testament. There are nearly 6,000 existing manuscripts, and just as many textual variants, with thousands of manuscripts having been discovered since the time of the King James Version. This commentary is filled with notes on significant textual variants between these manuscripts."