Unsingle is 34 .740 LM, M, IM, F, O/U is 32 .750 10,15,20,25,30. O/U barrel was new and fitted at Kolar in March of 2017 along with annual check up. At that time the stage II trigger was installed, $1700.00 upgrade. All work has been performed by Kolar Arms. Both barrels are fully adjustable. Pull/Pull Prosoft stocks a $5,000.00 option with fancy wood. Adjustable butt plate installed by Kolar Arms $300. Stock comb is 6 way fully adjustable. LOP is 14 1/2. $12500.00 Shipped and insured to your FFL PM for questions.