barrel hand guard

[pslvega]

Does s&w have a lined heat shield for ar15 sport

 

[BillyJack2012]

You can just pick up a heat shielded hand guard to replace the non-shielded Sport hand guards. They're all over the place as take offs or you can buy them new. It's a simple, no tools swap.

I don' have any experience with the ones linked below but it should give you a reference point.

Mako Handguard AR-15 Carbine Length Heat Shield Polymer

 

[Wolfman-Iraq]

Here's another one on eBay:
Carbine Length Handguard Car Single Heat Shield | eBay