I'm a new member to this site and am building my first AR, so thank you for any help.  I purchased a Spikes Tactical FN CHF 16' barrel which came with a micro gas block that has one set screw on the bottom and holes on the side for a pin.  The barrel is pre-drilled for the gas block pin and came with a solid, non-tapered pin.

My question:  How do I pin the gas block to the barrel without the gas block twisting out of alignment before the pin is set?  The pin seems really tight, so when I apply force, the block slowly twists out of place.  I've tightened the set screw, but it still seems to twist a bit.  The barrel is not dimpled for the set screw, which is described as an "anti-vibration" screw in the product description.  Is there a better way to support the block, or should the pin be so tight?  Thanks.

BRD Engineering makes the jigs you need.

put a 1/8 drill bit through the hole in the block and barrel to hold it while you tighten the set screw (the bit will act to align the combo). After it's tightened on there, remove the drill bit and place the barrel/gas block in a vise, horizontally (vise the BLOCK, not the barrel). Drive the pin in with a steel punch. Done.

Thank you.  I put a roll pin punch through and tried to use the pin to drive the punch out but it still rotated.  I'll try your idea to clamp it next, sounds like a good plan.  Thanks again.

Thanks for the site recommendation, they look like they have some great tools.  I'd like to find a way without having to spend more money, but this is an option if I get frustrated enough.  Thanks for the reply.