Major advantages to having a free float rail or tube:
1. Improved accuracy.
2. Being able to rest the gun and/or use a sling without shifting the POI.
3. Heat dissipation.
4. Weight - most FF quad rails are lighter than the non-FF versions.
Major considerations for selecting a free float rail or tube:
1. How thick / wide / tall is it?
I once had a YHM rail. It did the job, but was very heavy and very wide. I sold it for a more comfortable (read: slimmer, and lighter) LaRue. End of story.
2. How heavy is it?
3. How sturdy is it?
Here is a chart that helps with external dimensions, as well as weight. It is a great tool.
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