So, I have recently discovered that Handguard/Delta Ring System is alot more efficient on a RIS system on an M4. How is this so? 1. If wired to front: More options for stock customization. 2. If wired to back: Extra space to use for carrying anything you need such as: Tools for Field stripping, Speed loaders, Etc. 3. Either way: You can customize hadguard styles and even attach a RIS system to the delta ring on the Handguard style Barrel assembly. You can also use Magpul or many other types and customization that are alot cheaper and easier to replace. It's also alot easier to remove the front assembly on a Handguard system then on many RIS systems I've seen. I am personally making a switch over from RIS to Handguards. Any further comments, questions, or thoughts?