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David, The KE-9 DOES NOT have Last Round Bolt Hold Open (LRBHO) unless you use an upper with a linkage system built in to accommodate it. The AR15 magazine catch can be used to manually lock the bolt back, but Glock magazine followers DO NOT interface with it. To have LRBHO you muse use an upper with a linkage system that interfaces with the Glock magazine follower and standard bolt catch. Some manufacturers of 9mm uppers produce uppers with this feature.