Only worth it if you need a sd handguard or want m-lok - Lancer Handguard Sig Mcx 12" M-lok Carbon Fiber

This handguard isn't as light as advertised. It's about 192 grams after adding the link and an extra 3-slot piece of M-Lok 1913 which, is exactly the same weight as the standard OEM 12" handguard (slim not SD). If you're considering this solely for weight reduction, there's no benefit.

Lancer reduced the handguard's weight by removing ALL of the top-rail. The 4-slot piece of 1913 that comes installed on the handguard is connected by M-Lok and is not optional as it contains the index tab. If you need an extra 3-5 slot piece of top-rail for BUIS or something else, the handguard will weigh the same or more than the OEM 12" (slim).

Another problem is that the Virtus and Spear LT piston assembly sit too high to slide past the The M-Lok hardware on the 4-slot piece of 1913 rail with the index tab--so this handguard ONLY works with Legacy barrels.

The handguard looks great but, that's about the only thing it really has going unless of course you NEED a SD or M-Lok handguard.