Just wanted to Throw a plug in here for Todd @ SLR.  Put a gen 2 block on a blkout build.  Shut the gas off for a few rounds, and upon trying to open it back up, it seemed the screw broke.  Called SLR up, Todd told me they had had a bad batch of screws and this was a known issue, but one that had been fixed.  Got a new one shipped out ASAP.  I believe his words were, "We just want you to be satisfied".  And that is what i am.  Have a second one up and running on a grendel and it has been flawless.  The click adjustment makes everything super simple even for a moron like me.  Thanks again todd.

I second this.  Not only did Todd ship a replacement the day after I let him know that mine had a problem, he shipped a second replacment when USPS lost the first one!  Pretty unusual service.

Both of my AR's have a rail from them. They have been awesome on the phone and email when I have communicated with them. If their upcoming 308 rails work on a PSA upper, I will likely swap the rail that comes on mine out for one of theirs.

Same here...had a minor problem with a SLR gas block and emailed them around 6pm.  I had a response and tracking number for a replacement by 9pm the same night.  Awesome service and great product.