If you aren't worried about barrel length then go as long as you can, any increase in velocity is an advantage.
The US military found that the short 14.5" barrel in the M4 was found wanting...
Type: Posts; User: Beetroot
If you aren't worried about barrel length then go as long as you can, any increase in velocity is an advantage.
The US military found that the short 14.5" barrel in the M4 was found wanting...