That “Z” setting

Had another person ask me about the Z setting on the AR15 carry handle.  This setting, along with the great deal of misinformation about it, tends to be confusing.

If you are using a reduced range 25 meter zero on a M16A2/M16A4 or other 20 inch barreled rifle, you use the Z setting when you zero your rifle.

If you are zeroing a M4/M4A1 or other 14.5/16 inch barreled carbine you DO NOT use the Z setting.

What about Matech sights?  It is exactly the same, check out this link 670-20 if you don’t believe me.

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