Quote:
... the Glock 20 Gen 3 short frame is the same grip size as the Glock 20 Gen 4 when the smallest Gen 4 back strap is installed...
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The same applies to the Gen4 29 and the 29SF--and to any of the other Glocks available in both the SF and Gen 4 configuration.
The Gen 4 guns also have a different grip texture.