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All that will come to use somewhere eventually...

That makes sense too, mechanically. Can't see why one would want to do it though...range rules?

Yes, another method. I just use ex FA parts, converted except an SA selector. They all seem to run better. Leave the bolt alone...

That was done so the FA kits wouldn't work with the also new hammers...with the notch at the top. With the bottom carrier they would catch and cause a stoppage.