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AR15.COM
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9/27/2008 8:42:03 AM EDT
Whats the difference if any
Thanks
micko
9/27/2008 8:47:23 AM EDT
[#1]
The 6921HB upper is known as the SOCOM upper because it has a heavy barrel under the handguards. The 6921 is what goes on regular issue M4's.
9/27/2008 9:06:48 AM EDT
[#2]






9/27/2008 9:16:50 AM EDT
[#3]
great pics thanks
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