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Gen 5 Glock 17 / 19 are 1913 Rail Sized

Just in case you were wondering, the Gen 5 Glock 19 and 17 have 1913 sized rail holes, and not standard Glock holes.  Meaning a key for a Glock sized hole will fit the rail and may rattle around, but a standard milspec 1913 sized attachment will work perfectly.  I tested both the Streamlight TLR2GHL and Surefire X300u and the 1913 keys fit perfectly.