if its laid on a flat surface along the entire length of the shroud/body then no shift. but if shooting prone at full stretch the barrel is pushed upwards about 2mm.
the top of the shroud has now been milled off completely and its marginally better but it actually needs more taking off. opening up the top of the body and a full length spacer between cylinder and inside/bottom of the body. then il be happy!
ive made up new woodwork to replace te plastic. but being a modular design its easily done. but its capable of 5mm groups at 30yards indoors