Quoted:
I thought the spring insert just designated the type of spring (M4 etc).
Besides, if you have the Wolff spring, its really a mute point.
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Well, in fact, when they went from white to blue back in the '60s, it was to designate a stiffer insert, not a stiffer spring. Then, when they went to black (in the '90s?) it was supposed to mean a stiffer spring.
You're right, of course. Putting the Wolff spring in, along w/a blue insert (because I know that combo works) makes the question moot. But I am still wondering how come nobody ever saw a red insert until this batch of bolts hit the market.
Guess someone is going to have to call Colt to find out what it all means[:D]
Happy to hear that all you other guys got red, even tho it means I can't auction mine off on e bay for thousands of dollars[:D]
So, for all you Coltniks out there, there are FOUR, not three official colors of extractor spring inserts:
White--the first
Blue--the second
Red--the third???
Black--Current
Ain't life wonderful[:D]