most of the move to plastics is for cost-cutting and improving the bottom line.
it probably cost a whole $1 to make that part out of metal , the injection moulder can make that part for $0.05
and i bet they didn't pass that little savings along now did they?
a plastic-upped 10/22 ought to retail for $99--LOL!
a firearm made and designed for plastic has a chance to work but i don't like plastic replacement parts for metal OE parts.
a nylon 66 or a glock is one thing a plastic ar-15 lower with plastic FCG in another ball game.
the ruger is probably OK that said i sure as hell wouldn't buy it less it was give-away price.
next thing they will be making plastic slides and bolts!--LOL!
maybe hesse/vulcan will lead the way with that one--
plastic is generally OK for furniture, but moving parts, hi-stress structural parts , fire control groups-- i avoid these like the plague!
HK has plastic bits in some of their newer guns. No biggie. Today's plastics are much better than yesterday's plastics.