Yeah, I ran across this used M2 a couple weeks ago, so I bought it. I had to change the magazine spring. It had the original M2 spring in and it wouldn't feed the last round out of the magazine. So I brought a Nordic Components spring and trimmed it 16" longer than the mag tube as per their directions. It now functions perfectly. It feeds light loads without hang-ups. I had been expecting to wait forever for an M4 to show up. I think I'll keep them.