Hi,I am a new member.I have been reading for awhile,but never needed any advise till now.I purchased a 10/22 at a gun show.The gun has a Clerke bull barrel,synthetic stock all SS and looks like new.When I went to shoot it would fire,rechamber but would not recock.I shot it today and I used some hotter ammo (stingers).They would not even extract.I went back to the remington ammo and about every other round it would eject the fired round and the next live round.The last shot I fired the bolt stayed open,the empty stayed in the barrel and the next round in the magazine tried to load.I dissasembled the gun twise,I am not a gunsmith but the gun shows no signs of any wear.Somebody told me that bull barrels should use low velosity ammo.When I dissasembled the gun I noticed the pin at the rear of the bolt has a plastic sleave.I don't know if this is factory or if this is a buffer. :usa: