Sig MPX Carbon Handguard. These were made for us by Lancer Systems.  They are marked SHARPS BROS instead of Lancer.  14" Length.  

We were using these on the (now discontinued) Sharps Bros chassis for the Howa Mini Action.  

If you look at Lancer's website at these, they sell the 14" for near $350.  I've got them listed for less than half of that - just to move them.  They are all brand new.  -JSharps