FX IMPACT M3-M4 New Design plenum Oring kit
US$12.25
new design valve rod orings elimanate having to cold fire your impact to get up to target speed.
unlike the original fx oring which drags on the valve rod like a windsheild wiper on a dry windsheild
new size and compounds eliminate any drag resulting in consitant shot counts from 1st to last
complete oring kit comes with all orings needed to install the valve rod orings
END THE COLD SHOT PROBLEM ACCU-SHOT ORINGS