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From what I understand it is ore supported than the older Glocks I would suggest that you contact Glock and get the answer straight from them Phone: 770-432-1202 FAX: 770-433-8719

I have no idea what that even means. It must not be important if Glock doesn't say much about it.

Anthony, it is not truely Fully Supported but has more case support than previous Gen's. It has handled my handloads of Blue Dot and 135gr Noslers at 1700fps no issue. I shoot Underwood, Doubletap and Buffalo Bore frequently and have no issues.

Rudy the unsupported case is what causes the Glock bulge and makes the brass weaker for a reloader The feed ramp intrudes into the chamber and leaves part of the brass unsupported so the brass expands more there it does make a case failure more likely