I have a Kalashnikov USA, KR 103 AK rifle. I just purchased a US Palm AK Mag and had to use excessive force in order to lock the Mag into place. I searched this forum and couldn't find an answer to fitting US Palm AK Mags. I found a YouTube Video that answered my question and demonstrated the simplest, least evasive fix. At the 50 second mark, the solution is shown. https://www.youtube.com/watch?v=l18Z2NsFXMc Worked on my US Palm Mag and my reinforced Magpul AK PMAG.