I built two. A M4 clone 1-9 twist and a HBAR again 1-9 twist. Depends on your criteria on which one is best. Lighweight barrels might be better than mine for carrying around and taking just a few shots. Mine serve double or triple duty with sage rats in the mix so I don't mind the extra weight. But they are still highly portable and I'll use them from off hand to shooting sticks. 1-9" twist allows me to use 50 gr- 75gr bullets.
