Couple of drops of oil, smeared over teh bolt twice per days play, if you remember...just helps things aong...you wont swella delrin bolt, liek some twats will tell you.
The other thing is to add some lube to the rammer shaft (the bit that goes in and out of the rammer on the front) and work it in and out, to lubricate teh o-rings in there..job done.