I just bought a few surplus HK steel magazines but they're having issues feeding. It will load the first round fine, but the bolt just glides over the second round without picking it up. I can get it to work by tapping on the magazine a few times, then it'll load the 3rd round fine but then the...

I am having some issues with my HK MR556 14.5 barrel conversion kit that I recently purchased from HKparts.net. Any help would be appreciated. I am having failure to feed issues. I can only get one to two shots off at a time. After every shot, I have to rack it before I can get the next...