So I recently finished getting the tweaks figured out on this ar pistol . Was over gassing like crazy and ripping the rim off the casing , so basically a failure to extract . Bought an adjustable gas block and that solved everything . It ' s only a 7 . 5 inch barrel and it ' s from ESS so it ' s pretty cheap . I work for a high end button rifle company so I know what the inside of a barrel looks like and it was pretty rough . I lapped it a bunch and it cleaned up some but there ' s only so much you can do . I did manage to hit steal at 200 yards with it though and that shocked me quite a bit . I wanna go with a 10 . 5 in barrel once I have the time to make or find one at work . But with the noveske kx 5 I have on there it ' s pretty cool . Shoots a good deal of fire . But I found this nice little case in the back of the shop . It was originally from a Wilson Combat upper receiver . Specsparts used areMGS Firearms receiver setMGS charging handleMGS enhanced BCG 7 . 5 in ESS barrelAimpoint h 1 microSB tactical braceFortis handguardBcm gripNoveske kx 5 Slr rifleworks adjustable gas blockSurefire scout light