I'm assuming it was, otherwise I'm in trouble and i'm blaming LDD, LOL
I have two 31rd shearer mags w/ +2 on them, and I have 3 15rd w/ +2 on them. THAT SAID, I replaced the springs and followers as well, and while I don't have jams or anything (the 15rders have been put thru at least 1000 rounds of use), I just don't trust the +2 floor plate to be 100% reliable should I ever actually need to use my gun, so I only use them at the range... just some food for thought in case you were carrying this gun