Hello, does anyone have any advice on building a 300 blackout AR? I have a friend that gave me a deal on a spike tactical lower that I couldn’t pass up. My problem is that I don’t know how to build one properly. I have looked online and have not come up with anything helpful about the combination of parts to use or the rifle twist that I would need. I will be shooting 115 to 125 gr rounds around 100 to 250 yards and thinking about getting a suppressor in the future. Thank you in advance for any advice you have to give.