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Posted: 6/16/2009 7:33:01 AM EST
[Last Edit: 6/16/2009 7:49:19 AM EST by TurnAndCough]
I can remember that, for a period of time, Colt made lowers with slightly smaller(or larger) pins(and uppers with smaller(or larger) holes as a result?).

Is this something that colt still practices? When did they stop? The pins feel to be about the right size based on all the M16's and M4's I was issued. Without the aid of a micrometer, What is the easiest way to tell what size you have?

(I'm asking because I would like to slap a spikes dedicated .22 on my lower, if they were small(or large) pins, would it be a rattlely inaccurate mess?)

Thanks in advance.

ETA: I could have my info backwards, and the pins were over, not undersized. Sorry!
Link Posted: 6/16/2009 7:43:52 AM EST
[Last Edit: 6/16/2009 7:46:02 AM EST by efpeter]
I believe Colt has made oversize fire control group pins and oversize front pivot pins.

I think they were .170 and .315, where normally they would be .154 and .250, respectively.

I don't recall hearing they ever made undersize pins for anything?

The easiest way to tell is with a pair of calipers. If your lower does have the oversize pivot pin, you can buy an offset adapter to make it work with a .250 lug upper.
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