I hunted with a 742 308 carbine while my dad used the 3006 742 rifle the 06 started having problems when the bore began pitting and it would rip the rim off the case. the plastic piece in my 308 was never a problem however after the gunsmith pointed out this rifle has to be cleaned he recomended sea foam to cut carbon buildup remington offers a bore brush that works really well. also a light coat of rem oil. That said my 742 .308 carbine topped with a redfield 2x7 wide view, is the rifle i always want despite having several more expensive and "better" rifles. it's quick, stable, and range have never failed me.