What is the longest caliber (chambering) that one of these lowers will support?
Please forgive the noob question, I have a build in mind. I am not positive about all the possible calibers that the AR platform can handle, because I keep getting conflicting information. If you know specifically if the .308 Winchester can be fed through this lower, and if I can build an upper to accept that chambering, this one may just be the lower I am looking for.
My current rifle is in 5.56 but I am hoping to add some hunting power to my arsenal for longer shots than the wind drift and the rule of diminishing returns in energy production with hotter loads and heavier bullets allows for when using the .223 for game up to and including deer, hogs, and yotes, at ranges beyond 200 yards for the smaller critters and 100 or even 50 yards for the larger ones. I want a heavier caliber for some shoots, in other words, and the .308 Winchester is a proven round for extended ranges if I can utilize it in this platform.
If I cannot use .308 in this one, is there a polymer equivalent that I CAN use .308 Winchester ammunition in? Do I HAVE TO go with the heavier and larger AR-10 platform?