It's all about weight distribution i.e. center of gravity - Lancer Replacement Handguard for Sig 516

My complaint with the stock Sig 516 is the forward weight of the firearm... it's forward heavy, not balanced.

This thing is fantastic. When mounted It feels great in the hand. The carbon fiber, fit and finish is quality stuff. It's not substantially lighter than the stock Sig 516 Patrol picatinny rail grip. What is does extremely well, is re-distribute the weight aft, i.e. moves the CG (center of gravity) back to the mag well.

Having replaced the handguard, buttstock and buffer. The latter a Doublestar Skelton ARFX and JP Silent Capture Spring. The net effect with a Vortex Viper PST 1-4x24 scope, yields a firearm which in the hand is supremely well balanced. The CG is centered on the mag well just slight behind the breach. It no longer feels like I'm trying to aim a one ended dumbbell.

I'd have clicked 6 out of 5 stars were the screw hardware not garbage and complete with all necessary screws. The unit ships without the two screws that secure for locking lug seating on the barrel nut. The stock handguard on a Sig 516 Patrol uses two longer counter sunk screws. This unit requires shorter caphead screws. The real gripe is the cheap metal screws that secure the upper to the lower halves together. The hex heads strip like made of silly putty.

That said, in the end, despite the inconvenience of replacing some screws. I'm totally pleased with the my purchase. I hope my complaint about the screws gets attention.