Rods For barrel/suppressor Alignment

So I got this from ar15 fourms and it helped me so wanted to share. You can buy them from McMaster Carr

Here is a copy of the post with item numbers and which it will work for.

8893K191- works for .22 -very small amount of play but works just fine
8893K193 - works for .223 / 5.56 - nice and tight, pretty much exact fit- fit in everything I tried except a brand new unfired BCM barrel
8893K219- works .300 blk/ .308 - tiny, tiny bit of play- works perfect
8893K231- works 9mm- small amount of play but still works just fine

I cut the .300/.308 and .223/5.56 into 2 rods and the .22 and 9mm into 3. I used a porta-band and then carefully sanded and polished the ends