The Daniel Defense DDM4V7 Upper Receiver will work with any length buffer assembly as long as you use the correct weight buffer for optimal reliability. I would recommend a H buffer for this upper.
Yes, the Daniel Defense DDM4V7 upper receiver will include the pictured M-LOK foregrip.
Yes, the Daniel Defense DDM4V7 will be compatible with a CA compliant DDM4A1 lower receiver.
The Daniel Defense DDM4V7 will fit to any Mil-spec AR15 lower receiver. So it will fit and function as intended on your Franklin Armory Libertas Lower Receiver.
Yes. The Daniel Defense DDM4V7 upper receiver will fit to any standard, Mil-Spec, AR-15 lower receiver.
Yes. The Daniel Defense DDM4V7 Complete Upper Receiver will fit and function fine on the Sig M400.
The Daniel Defense DDM4V7 has a gas port size of .076"
Charging Handle: GRIP-N-RIP Charging Handle, Body CNC Machined of 7076-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized
The BCM is standard DD M16 Mil-Spec
No, the DD5V3 is an AR-308 platform, this is only for AR-15 platforms.
Yes, you can remove the flash hider and replace it with a different muzzle device.