If you want a 6.5lbs trigger pull on your sigma watch this : http://youtu.be/R08WgakoN_8?list=UUhrw0-xiWDSBmCKd4hU4AVw
I can lower it down some more but I'm happy for already cutting the trigger pull in half. Best of all I did that without buying anything.
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https://www.youtube.com/watch?v=BBKiEEtO_pg
On our way to Yellowstone we passed by Pueblo Colorado where a flash flood just happened a few minutes before we entered the city. Thank God our Explorer made it without any problems
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https://www.youtube.com/watch?v=H46JTqaHSDE