I have my CMMG Dissent for sale. It's a 6.5 in barrel. I've ran 200 rounds of SS197 and 100 rounds of American Eagle with no issues. It uses FN 5.7 Pistol magazines. Solid platform, no recoil. Including 2 mags, original box/manual and Model: FS1913 SB Tactical. Solid setup and accurate. Any questions please ask. I'll add a box (50) of SS197.