Well I blew the first poppet I made apart dry fired at about 50 bar and I think the outside of the poppet bottomed out on the outside of the chamber and that was it for that lesson learned so I made another poppet with a longer spring guide so if it were to bottom out again it would do it on the inside of the chamber so the stem doesn't break apart the poppet again made this one to .325 and took the front of the poppet down to about .235 and got the oring to fit good I the 1/4 inch sized chamber which I took and lengthened the depth of the chamber because of the slightly longer poppet I didn't lap this one in yet just threw it together it has a 30 degree sealing angle and pretty much sealed all the way up I have under a 150 bar left in my tank apparently my bottle oring decided to let loose now to so I lost a bunch of air before I realized what was going on I put in as much air that would go after changing the bottle oring about 125 bar or so and I have a ever so slight leak yet at the poppet tried 2 shots and got 672 and 676 which were both off the reg since it is set at 150 I'll probably need more tension on ssg and give it another go after I lap in the poppet and fill my small 90 cu in bottle back up so I can try it above the 150 bar setting may need to shorten the poppet spring guide or just open up the vent holes poppet has about 3/16 of travel before it bottoms out on the inside and vent holes are at only .050 total between the 2 of them so I should have a working cobra valve tomorrow after lapping it in power adjustment will take some tweeking though it is sipping air at just under 700 fps though lol