I think I have the double lapped,but I'm not sure. I took this gun on a trade,and the add said 1/7 twist ,chrome lined barrel. But when I got the rifle ,it was stamped 1/9!twist. Arms east shows this as double lapped. I'll call tomorrow to verify.If you are looking for accuracy the double lapped barrel would be the one to go with. Chrome lined barrels are generally les accurate but will stand up to fast fireing and high volume of fire better. That is why Chrome lining is wanted by the military



























