05-26-2020, 08:39 AM
Welcome! Good choice on the Grendel Hunter upper. Good company, great CS, and very reasonable $. You can absolutely run your Carbine extension & buffer.
I personally would use this spring
https://www.joeboboutfitters.com/Strike-...-fws-c.htm
And this buffer
https://www.joeboboutfitters.com/Kaw-Val...er-4.3.htm
Because it will shoot a little smoother, but there's no NEED to do so.
I personally would use this spring
https://www.joeboboutfitters.com/Strike-...-fws-c.htm
And this buffer
https://www.joeboboutfitters.com/Kaw-Val...er-4.3.htm
Because it will shoot a little smoother, but there's no NEED to do so.

