The weight is negligible and it covers up no more surface area than standard rail covers do on the heat dissipation front. I've got one on a NSR and have been using it for over a year now because I couldn't stand the NSR covers at the time as far as durability, feel, and heat protection go. It has a slightly gritty feel that gives nice traction and if you're using it on a hunting rifle it allows you to be absolutely silent when moving the rifle over a barrier/tree stand tracking a target. Not to mention it's wrapped around the handguard as close as possible without any noticeable addition to diameter.
The combination of the velcro strips on each end running the length of the cover and the cord strung up in between the 1913 sections makes it unmovable when it's installed.
The reactions to it in person are funny though. I've had guys at the range scoff at it numerous times and even got a "how tacticool of you." For a piece of material wrapped around a handguard and strung up with some cord it really rustles some jimmies. But for what it costs and how it performs compared to other tubular handguard cover options I couldn't care less about how people perceive it. It works and it works well.
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