I recently purchased the Sig M400 Tread. I have come to find out that even when zeroing the rifle the manufactured handguard get hot. There is one alternative handguard from Sig however,( https://www.sigsauer.com/store/handguard-m400-tread-enhanced-13-inch-mlok-blk.html), like most Sig products; they're proud of it. Any suggestions on alternative handguards that are compatible to the weapon system?