There are YouTube videos and threads here on how to drill a small hole in the tube, which lessens the pressure and helps the shells drop closer than before! It needs to be done right and with the load you are going to fire if you want to tune it properly! A good idea would be to buy an extra tube so you will leave the original one stock!HI; I do not wish to chase reloading 762X39 brass around the range.
Do I, remove the gas piston?
take off the gas tube and piston, will there be much gas venting out the port?
Remove the piston and re-install the empty gas tube.