Any handguard with a 1.7" ID should be gtg. JP, Apex Machine, Seekins, Sampson Mfg are a few options off the top of my head. Many more probably fit the bill. I tried with a KAC URX4 (1.55" ID) but it was too tight. Depending on your rate of fire, grip locations, and how much of the can you cover it's very possible to see a significant jump in the heat you're feeling through the handguard. Just a heads up as you consider the available options...