Hi,
Yes, it will fit.
Thank You.
The barrel nut is not included, you can find the barrel nuts here: https://www.opticsplanet.com/aero-precision-m5e1-handguard-barrel-nut.html
No, this will not fit Sig 716 rifles.
You can find the barrel nuts here: https://www.opticsplanet.com/aero-precision-m5e1-handguard-barrel-nut.html. They use any standard AR armorer's wrench, this is a popular option: https://www.opticsplanet.com/real-avid-armorer-s-master-wrench.html
No, the Aero M5 is based on the DPMS high profile, M&P would need a DPMS low profile handguard.
No, no end cap is required as this is a free float handguard.
Yes, Aero Precision typically includes the required screws for installation.
Yes, they are Gen 2.
Nothing else comes with it, it's just the handguard.
These are high profile.