It's likely an internal casting mark to simply be a marking of the manufacturing run the part was made in. It has no significance on the sizing or fitment to the end user.
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POF USA
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Gun Parts
POF USA Gun Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
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AR 15 Parts
POF USA AR15 Parts
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AR15 Lower Parts
POF USA AR15 Lower Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
Rifle Parts
POF USA Rifle Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
+
AR 15 Parts
POF USA AR15 Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
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Rifle Parts
POF USA Rifle Parts
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AR 15 Parts
POF USA AR15 Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
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Rifle Parts
POF USA Rifle Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
+
AR 15 Parts
POF USA AR15 Parts
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AR15 Lower Parts
POF USA AR15 Lower Parts
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AR15 Bolt Catches & Releases
POF USA AR15 Bolt Catches & Releases
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
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Gun Parts
POF USA Gun Parts
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Rifle Parts
POF USA Rifle Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
+
AR15 Bolt Catches & Releases
POF USA AR15 Bolt Catches & Releases
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
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What does number 6 mean when looking at the picture. On POF's website it has a number 4. — 1 Answer
by TeaGuy, from AZ, United States Asked on July 15, 2020
POF USA
+
Gun Parts
POF USA Gun Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
Rifle Parts
POF USA Rifle Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
AR 15 Parts
POF USA AR15 Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
Rifle Parts
POF USA Rifle Parts
+
AR 15 Parts
POF USA AR15 Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
Rifle Parts
POF USA Rifle Parts
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
+
AR15 Bolt Catches & Releases
POF USA AR15 Bolt Catches & Releases
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
POF USA
+
Gun Parts
POF USA Gun Parts
+
Rifle Parts
POF USA Rifle Parts
+
AR 15 Parts
POF USA AR15 Parts
+
AR15 Lower Parts
POF USA AR15 Lower Parts
+
AR15 Bolt Catches & Releases
POF USA AR15 Bolt Catches & Releases
POF USA Universal Bolt Catch Black Anodized 00667P
POF USA Universal Bolt Catch Black Anodized 00667P Q&A
Question - What does number 6 mean when looking at the picture. On
Last updated 2025-11-12 UTC.