MLOK handguard for the SIG 553 (newer version). 
 
Specs:
Fits newer SG 553 variants with GEN 2 rail receiver. The height of the top rail sits flush with the rail on the receiver.
Material: 7075-T6 / 1.7227
Type III Anodized / QPQ Tenifer
Weight 255 g
Designed and made by Acheron Switzerland