This is the Chip McCormick 1911 Match Grade .45ACP 8 Round Magazine.

The stainless steel match grade construction holds up to 8 rounds of .45ACP ammunition. And no more guessing how many rounds are left – there are witness holes on the right and left side of the magazine. Its improved tolerance stainless steel USGI-style tube comes with enhanced feed lips. This Chip McCormick Products 1911 magazine is match grade, and features a welded baseplate for ultimate durability. Pick up a few of the Chip McCormick 1911 Match Grade .45ACP 8 Round Magazines from The Mag Shack.