- Feb 17, 2011
- 14,024
I am building 2 ar-15 rifles and one I am thinking either 300 black out or 6.8. It will be a 16" barrel. So what are the pros and cons of both?
I am building 2 ar-15 rifles and one I am thinking either 300 black out or 6.8. It will be a 16" barrel. So what are the pros and cons of both?
300 BLKOUT PRO'S
ALL but the barrel are AR-15 parts
Great for subsonic rounds
300 BLKOUT CON'S
limited supersonic performance (case size)
6.8 PRO'S
Excellent supersonic performance
6.8 CON'S
requires mags, bolt, and specific barrel
slightly more limited bullet selection (.270 vs .308)
I thought that with 300 blackout a pistol gas system helps with subsonic but horrible for super sonic and carbine is better for super and ok for sub.
300 BLKOUT CON'S
limited supersonic performance (case size)
Not that limited. 300 BLK has as much energy from a 16 inch barrel as 5.56mm has from a 24 inch barrel.