Straight trash - Killer Innovations Velocity Glock 17 Magazine Extension

Purchased 3 and installed them accordingly. Finally got out to the range. Loaded up all three magazines to capacity and every magazine, every time, failed to feed after 13 rounds. The last 6 (because I have them on a 40) fail to feed every single time no matter what. The failure to feed on the 13th round and every round is the most reliable thing about them. The only good thing about them is that you will get really efficient with malfunctions. They probably need to look at the magazine spring and increase a few coils. I ended up getting 3 more extensions (different brand) and they worked perfectly.