V•RIFLERELOADINGDATA TestSpecifications/ Components FirearmUsed:ColtAR-15A2HBAR BarrelLength:20" Twist:1x7" Case:Federal Trim-toLength:1.750" Primer:Rem71/2 Remarks: Inadequateformilitarypurposes, notasaccurateasthe222Remington, andlesspowerfulthanthe222 ...