They're worth a bit more if they're in mint/new condition. How much since the AWB is sunsetting? That's to be seen. A year ago, I sold some for over $30 each. There are mag collectors that'll pay a bit more depending on type. Here's a break down of what I've seen and collected in the .223 marked 20's.
1 - Common .223 with the dk gray/purplish anodized base plate. Bast plate stampings range from fine to dull.
2 - Has a 1 with a circle around it on the lower part of the mag. The base plates are a bright silverish (no anodizing?) The stampings have sharp larger fonts. I've read that these were for the SP1's.
3 - The rarest of the bunch have mag bodies that have a greenish tint to the mag bodies. There's no 1 with circle on the body and the base plate is similar to the #2's.
I bought four of #3 from a vendor that was selling a large store of new 20's a coupe of years ago. Out of the hundreds, he only had 4. I found 8 out of a lot of several hundred when I was doing a gig buying and selling years ago.
Hope this helps a little.