To insure proper fit of the forearm between the receiver face and the mag tube bracket(ring on bbl), forend spacers are furnished with new forearms.
Spacer no.1 (complete circle) grips into place and spacer no.2 and no.3 (horseshoes) are then added to minimize the looseness encountered when the forearm is assembled and the valve assy(mag tube cap) is tightened in place.
The spacers go on the forearm...magtube cap side. Full ring first, horseshoes after.
More spacers can be added if forearm remains too loose.