Hi all, bear with me as I'm new to firearms and I'm still learning the lingo.
After much research I bought an EAA Tanfoglio Witness PS in 9mm (a CZ clone). I bought it at a gun show as my local dealers did not carry the line, and after dry firing at the show I decided this was what I wanted. Went through PICS and bought it. It only came with one mag. So I looked around for another at the show. A seller can The Mag-Man said he had one. I looked at the packaging (correct part number), and the mag. Looked the same except for a black follower instead of red. Slid the mag into the pistol. All seemed good. The only difference I could see at that time was the follower was black, not red like the OEM one. So during my first shooting lesson, the instructor loaded the mag with black follower and slid it home (with some force) with the slide open. The slide closed without him touching the release. He looked at it funny. Dropped the mag, cleared the chamber, and left it open and did it again with same mag only less force. It stayed open. Dropped it and did it again harder, it closed. Dropped and cleared, and tried the OEM mag (with red follower)... the slide stayed open regardless of how hard he slammed it in.
Mind you, the other mag (with black follower) works just fine, no jams or issues, just sends the slide closed when inserted too hard. After a closer look, I can tell it's not from Tanfoglio. The way it's shaped at the top is different.
Should I still use the questionable mag?