Tightest set I've ever owned. Though, I've never had an upper/lower combo from the same company before either. So far I am loving this. I'll have another set I am sure.
I'd light to replace my BCM upper/Meger lower rifle wearing a Noveske NSR with another SMOS upper lower.
I meant to take a comparison shot of the SMOS and my NSR last night but I forgot. It's pretty much just an MLOK NSR rail. Same goes for the receivers. They're essentially Noveske Gen 3.
Here is an old shot of my other rifle with the NSR before I put the panels on.
Carrier by Damage Photos...
Grabbed this over the weekend. Was a 28" barrel. Chopped to 18.25 until I can finish my trust and then it'll be my first SBS.
Future SBS by Damage Photos, on Flickr
You can try running a small pipe cleaner in there to see otherwise you're going to have to flush it with liquid.
If it comes out clear, shoot it again. As the other guy said, lube the hell out of it. If you're still having issues you'll need to check the gas block alignment, though if one mag...