I cleaned it for the second time ever (I’ve had it for years) the other day, and after reassembly the upper/lower fit has play in it just like an AR15. It rocks left and right, no forward or backward movement. I’m assuming because the optic is on the upper half, as is the barrel/receiver, this shouldn’t affect reliability or accuracy.
You got me curious since mine doesn’t have that problem even though it has been shot and stripped quite a bit. The info I found seems to indicate that happens from being disassembled ALOT so that sounds kinda odd. The general consensus seems to be call Ruger and they will take it back and fix it.
Fwiw, I have the same setup. I have an RMR on mine…& my upper also has play in it…but much like ARs, it has no affect on accuracy in my example…I assume because the optic moves with the upper??