Did you by chance push a pellet through the barrel? This could give some indication of a defective barrel with tight or loose spots. To eliminate the loose stock why not try shooting the rifle without the stock on it?
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I cleaned my barrel yesterday with a .17cal boresnake. It was easy to take the barrel of too. Gave it some nitro solvent and pulled the snake through 5x. I found no lead residue and the barrel before cleaning looked mirror polished. If I were to say anything the barrelscrews ought to have been on the side then one don`t have to take the barrel of. If the system dhould have been perfected a sidelever latch a la Mg42 machinegun for quick barrelchange.I haven't made any changes yet, still working on a plan for polishing. I'm going to clean my barrel and do some testing and tuning with some JSBs today.
I'm going to throw it in my gun vise and see....Did you by chance push a pellet through the barrel? This could give some indication of a defective barrel with tight or loose spots. To eliminate the loose stock why not try shooting the rifle without the stock on it?
It would be wise to eliminate it as a possible cause. I may try one magazine's worth in the middle of the day tomorrow. It is loud without a mod and I have neighbors on both sides..........Have you tried to shoot without "muffler"...