As above all it does is to stop a pellet from getting stuck just under the barrel and the transfer port thats it.
i too removed the poor foam one after it got a bit wet. however i made some new ones up using neoprene ( closed-cell ) so it does not hold water, in different thicknesses as the barrel to transfer gap might be a tad different from rifle to rifle. jobs a good one so far,,,,,,, kenny
My rifles are =
PCP: Steyr lg110 hft 2014, HW100 SK ( back up & rainy day rifle )
Springer's: HW77 ( 1980's version ), HW35 KLS.