How to install a rear takedown pin wk 180 ?

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So I got a KD upper/ Spec 180 WK lower and it’s got a bit of play in it.

I’ve tried the oring but that’s useless.

I know most people aren’t bothered by the slop, but it bugs me.
So I’ve wrapped the rear with electrical tape and it actually feels way better.

So my question is, do anybody have any idea on how to install a rear takedown pin on this?
Something that will keep it nice in tight. Like a Russian .. ahh never mind.

Any ideas are mucho appreciated.

One other thing, any idea why KD upper is Blue and the Spec lower is black?
 
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