the fact of the matter is, you want you weapon to be able to shoot for as long as possible without failure. sure, an M4 can pop rounds with 1 gas ring- you still want the best seal you can get. what difference does it make why your weapon won't operate with aligned gas rings when you're experiencing SSing in the middle of a firefight? rhetorical- i need no answer.
in reading the few threads on mcfarland coil rings, i havent seen anyone address coil expansion.. most of the negative opinions are that once the oil is blown out of the bolt chamber and crud is blown in, the ring bogs down from friction between ring and chamber alone.
considering what i know about heat and expansion, could it be that rather than it bogging down from a lack of lub and the introduction of crap, the coil expands as it gets hot? there isnt a steel spring or coil in the natural universe that doesn't expand and contract with temperature.
its a 4 coil ring- the longer the coil, the more drastic the expansion. could this design be improved by introducing expansion relief? seems like simply cutting the 4 coil in half, making it a two piece setup, would cut the expansion in something like half. aside from possible excess play (i havent tried the McFarlands, so i don't know how snug they fit the ring slot), i can't see how a two piece design could be any less effective than a 1 piece, considering its sole function is as a pressure seal.
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Originally Posted by August
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