Take an M-14 & cycle the action out of it's stock.
You can see the Op rod spring kinking as it compresses using the stock Spring guide.
Does it affect accuracy? Yes. We make a special NM spring guide that fits the inside of the spring.
Building an M1A/M14 into a NM rifle means you must make every action repeat the same way each time.
On my 1911s I have removed any FLGRs & replaced them with the GI setup.
I only ask that my 1911s always shoot & hit what I point & shoot at 25 yards.
Think about how many real improvements have been made to JMBs 1911? The 1911 A1? Maybe.
I mean real improvements not just pretty. Damn few if any Shock buffs, FLGRs, Magwell funnels, spur hammers,
Beavertail safety, finger cuts, Arched MSHs. Like the Ruger 10/22 so many add ons that do nothing to improve
on the org design.