07-31-2020, 12:38 AM
Great info from VASCAR above with some real world numbers. If you're serious about shots at 500 yards, my rough calculations show a 24" will juuust barely be pushing the 123gr SST at 1800 fps, which is (as I understand) the expansion threshold for that bullet. An 18" barrel should have the SST expand a little past 400 yards at sea level. Lower atmospheric pressure (higher altitude) would extend the range for both.
I'd give Criterion a good look, as they're an excellent value at around $300: https://criterionbarrels.com/products/ar...ar-barrel/
Or contact Mark at Precision Firearms and let him know exactly what you plan to do. If you don't mind waiting, he can turn the exact barrel you want into a reality: https://www.precisionfirearms.com/48m8/b...rrels.html
I'd give Criterion a good look, as they're an excellent value at around $300: https://criterionbarrels.com/products/ar...ar-barrel/
Or contact Mark at Precision Firearms and let him know exactly what you plan to do. If you don't mind waiting, he can turn the exact barrel you want into a reality: https://www.precisionfirearms.com/48m8/b...rrels.html