I want to buy a Magpul PRS for my AR-30. I understand that the AR-15 PRS is shorter than the AR-10 version, and has a longer cheek riser (therefore a better option for this application than the AR-10 version). I have been looking around at pictures of AR-30s with the PRS and have found that the eye relief looks REALLY long. Is the eye relief with the AR-15 PRS on an AR-30 resonable being that it is shorter? If anyone has any experiance with this, then I would love to hear your input. If the eye relief is still too long, then I would rather just keep the OEM stock it has now.