justin 0 Posted May 26, 2007 Report Share Posted May 26, 2007 Hey from what i have heard the best way to get the s20 to cycle all types of ammo is by changing the port size. But the hole problem is there are many opions on what size seems to work best, What one realy works the best?, because i want to be able to shoot all types and lengths out of it. Next how do you get acess to the port system is there directions in the owners manua, is it easy to do?I also want to find out if i have the ass backwards gas selecor how can you tell. Quote Link to post Share on other sites
dinzag 31 Posted May 27, 2007 Report Share Posted May 27, 2007 Press off the gas block. There are 3 ports under it. I drilled mine to 0.093" (3/32") they are 45 degrees off vertical pointed rearward. Start smaller if you wish. Quote Link to post Share on other sites
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