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Here's the how to installation video - https://www.youtube.com/watch?v=gn8PTqk4_io
Its the 6 mm allen head screw
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Its the 6 mm allen head screw here's the how to installation video - youtube.com/watch?v=gn8PTqk4_io
Emanuele, this kit has adapter/spacers and you would use the screw that fits the number of spacers if any you use. Example : just the pistol grip installed would use the shortest screw, the wider spacer, you would use the second longest screw and if everything is used you would use the longest screw. P.S. the washer would be used on whichever screw you use.