Hi. I hope this helps some people on taking off the gas block on the S12. If the pins are being stubburn, spray some WD40 on the 2 pins and let it soak for 5-10 min. Then use one of those small metal phillips head screwdrivers as a punch and using the brass hammer. I have both pictured with the Punch set that the brass hammer came in and the small screwdriver pointing to to pins that need to be punched out and what side. I used the largest brass punch with the brass hammer and brass punch to knock off the gas block by alternating sides while hammering. Some of the brass punch might deform and break off some bits of brass but should do the job. Gas block came off after about 5 min of doing this. Just reverse the steps to get it back in. Hope this helps.