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Here's a few options that don't involve risking ruining your G27, big range in prices
http://www.opticsplanet.net/caa-glock-under-barrel-rail.html
http://www.beamshot.com/mounts_p_mounts.html
http://www.opticsplanet.net/beamshot-ut1-lasersight-accessories-mount.html
http://www.opticsplanet.net/caa-glock-under-barrel-rail.html
http://www.beamshot.com/mounts_p_mounts.html
http://www.opticsplanet.net/beamshot-ut1-lasersight-accessories-mount.html