I picked up several boxes of these from a friend. He said he bought them in 1992, and I am assuming the 91 on the head stamp is the date of manufacture. They have been sitting in his safe for almost 20 years. I shot one box of them through my G19 with no issues. I am assuming they are +P rounds due to them being Mil Spec rounds and did not shoot any in my other 9mm that is not rated for +P. I was hoping someone on here might be able to tell me more about this ammo. Any idea what the L and Y stand for?
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View attachment 165962