I am looking into getting the CQB-R block one and replacing it with a grey Magpul SL handguard; as I've seen here, someone had posted, and it looks very nice.
I read the SL needs the front sight and other gas blocks not compatible.
Not sure how true that is as I saw a YouTube video with a different gas block but not sure what one it is.
Images of some gas block I've seen for sale.
Thank you.