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I have one of these....actually two. One in a 9" the other in the 7" version. Use your original delta ring and you'll no problems. You will need to get a low profile gas block for the 9" version. That could be problematic if you want your pins to line up!!! I cut and dremmeled my front sight to a low profile gas block to get around that problem. If you are not preparded to do that just find a gas block with a grub screw to set it. Also you may need to some work to the gas tube to get in the hole of whatever gas block you use, plus the alignment of the set pin. The rail itself slides over the delta ring and pinches it by 4x set screws.
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