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The Noveske N4 Skinny Rail Handguard will not fit a Sig 516. I would recommend the Midwest Industries SIG 516 Extended Free Float M-LOK Handguard found using the following link:
https://www.opticsplanet.com/midwest-industries-sig-516-extended-free-float-m-lok-handguard.html
Yes, the Noveske N4 Skinny Rail Handguard is compatible with the Noveske Vltor Upper.
Unfortunately there is no consensus on what "combat rated" would mean. All we can say is that this item is not used by the military and therefore actual combat performance has not been measured.
The weights are listed just above the code for each length.
Yes, it will.
Yes, this should work with the Geissele low profile gas block.
INSIDE DIAMETER: 1.35"