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Yes, they prevent loose rotation and are securely held in place.
Yes, modern Colt AR15 rifles use 0.154" trigger pins. Only 1991 to 2009 model Colt AR15's used large trigger pins.
The Wilson Combat Anti-Walk Hammer/Trigger Set Pins are standard USGI .154” diameter pins (small pin).
The Wilson Combat Anti-Walk Hammer/Trigger Set Pins should work for a Sig 716.
The black Wilson Combat Anti-Walk Hammer/Trigger Set Pins are also stainless steel just with a black finish.
Yes, these Wilson Combat Anti-Walk Hammer/Trigger Set Pins will work with the Geissele 2 Stage Trigger.-
No, these Wilson Combat Anti-Walk Hammer/Trigger Set Pins are designed to be used in Mil-Spec AR15's. They will not work with the Fostech Echo AK47 Trigger. I recommend contacting Fostech in regards to compatible trigger pins for that trigger.
The manufacturer doesn't state what size hex head the Wilson Combat Anti-Walk Hammer/Trigger Set Pins use. I recommend contacting the manufacturer in regards to that infromation.
These Wilson Combat Anti-Walk Hammer/Trigger Set Pins are made of steel and either come in the black or stainless finish.