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AR15.COM
5/14/2011 4:43:29 PM EDT
The front MBUS on my new ACR does not have a detent in it.
Is there supposed to be one?
5/14/2011 8:19:07 PM EDT
[#1]
The MBUS does not have a detent. It shout have come with a locking pin you can insert, but many people just screw it to the correct elevation and leave it.

Posted Via AR15.Com Mobile
5/15/2011 6:39:19 AM EDT
[#2]
Found thelocking pin.  Thanks.
5/15/2011 9:23:51 AM EDT
[#3]
Do yourself a favor and sell that MBUS and buy a Gen2 MBUS with the built in locking mechanism. A much better design.