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Rock river lar-8 20th bull barrel

222 Views 8 Replies 3 Participants Last post by  FL Moore
Just picked this up need to move the scope get new mounts. And a bipod I'll see how it does later.

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That scope is mounted too far rearward for you to get good head placement and eye relief while maintaining good contact between your shoulder and buttplate. You will be trying to “turtle” your neck back to center your eye in the correct position.
Here are a couple of pictures of scopes mounted for optimum head position from multiple firing positions. Notice how far out over the hand guard the scopes are positioned. I would turn the front ring 180 degrees and move the whole setup further forward. Leave the rings loose and get behind the rifle, then get a good head position and slide/move the scope and rings to get the best sight picture possible. Then you can torque down the fasteners. Just my $.02
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Yes, larger case head diameter (.473” vs .378”) and higher SAAMI max chamber pressure (62,000 psi vs 55,000 psi) means more steel to keep it in check. Coupled with a longer stroke, that bolt carrier group will feel much different than an AR-15 while cycling, especially when it slams back into battery.
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