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Surefire m73 shifting POI
I recently installed surefire M73 rail on my RRA 16" M4 profile upper. When I got to the 50 yard range on Saturday, I noticed that i had to move the rear sight one click to the right to center my group. Is this expected behavior? Will there be any long term effects on the barrel?
Thanks.
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FWIW I also have a M73 on my RRA upper with a customized 14.5 heavy barrel. I also had a small shift in my zero most likely due to the method the handguard mounts to the barrel/upper receiver. I have had no shift in zero since sighting in after installing the M73 that can be atributed to the rail. Also I have noticed no loss of accuracy since the install. I have just shy of 2000 rounds through the upper since the rail was installed.
Robert
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What is happening is the different Railed Handguards are effecting your barrel harmonics differently than your stock HGs.
POI may change if you mount a Forward Grip, Flashlight or Bipod etc..
This is why many prefer Free-Floated Handguards.
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