http://www.apexhandguard.com/2250-ar...rip-handguard/
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A few of threads with good information. My opinions are posted in there.
https://www.m4carbine.net/showthread...one-have-input
https://www.m4carbine.net/showthread...sh-hider-upper
https://www.m4carbine.net/showthread...tac-alpha-rail
I've been looking into similar rail options. The number of options seems to be dwindling.
I have had experience with the RIS II before. The quality is excellent.
Unfortunately, both FSP options are sold out on DD's website:
https://danieldefense.com/rail-systems/ris-ii.html
Daniel Defense FTW. 9.5 Lite Rail FSP is awesome. As is the RIS II.
My 9.5 Lite Rail FSP upper is actually for sale right now
http://i345.photobucket.com/albums/p...psv6qpjt4b.jpg
And
http://i345.photobucket.com/albums/p...psel7q0nv1.jpg
Yes, but it is one piece so you will need to remove the FSB and front handguard cap along with the low-pro gas block to remove the delta ring, snap ring, and spring or if you don't want to remove the low-pro gas block you can cut off the delta ring, snap ring, and spring. The sling swivel tabs on the FSB need to be removed prior to re-installation, there are slots in the handguard to access the FSB taper pins.
I'd love to get the RIS II Mk 18 FSP. I even send DD an email hoping they'd make them again. :(
To clarify, based on your link, you're looking for a midlength cutout?
I can't speak to quality, but Strike Industries has a 14" midlength cutout rail that appears similar to what I did with the NSRs.
http://www.strikeindustries.com/shop.../1/_/1_9_4.jpg
I think all the other midlength options have been mentioned . . . Troy, Centurion, Samson, Fortis, Apex, and DD