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Posted: 5/1/2011 6:10:06 PM EDT

I am installing new front sight pins on a standard front sight and can not get them to go in..
I ordered DPMS taper pins and the upper is a Double star.
The pins go about half way in then mushroom out and will not go any farther.
Everything is lined up with the holes.  A friend pounded the old pins out to try to fix a lean in the front sight that caused my rear A2 sight to be adjusted all the way out for windage.
I am thinking maybe the front sight pins I ordered from Brownells are the "oversized"
I cant mic them at this point because they mushroomed out and I had to pound them back out.
I had them in right but they will not budge.  Used a punch and hammer.
Link Posted: 5/1/2011 7:27:33 PM EDT
Are you sure the pins you removed WERE tapered ?

What was your plan for repositioning your front sight?
Link Posted: 5/2/2011 5:15:41 AM EDT
The pins on my Doublestar upper are straight pins. I don't think taper pins will work too well in it.
Link Posted: 5/2/2011 5:29:34 AM EDT
There are a number of companies out there who use taper pins that are not hardened.  Those are a PITA to work with.  I tried removing the taper pins on a CMMG barrel to check the gas port because of an undergassing issue, and the pins just squished like butter.  I ended up having to drill half way through them then used a thin punch to remove them (this had the effect of pulling them out rather than pushing them.  I reinstalled using Colt pins which I know are hardened and they worked perfectly - I was able to drive them in hard with no deformation.

Try a different set of pins.  Make sure they are hardened, and do not cheap out on them.
Link Posted: 5/2/2011 6:41:05 AM EDT
Quoted:

I am installing new front sight pins on a standard front sight and can not get them to go in..
I ordered DPMS taper pins and the upper is a Double star.
The pins go about half way in then mushroom out and will not go any farther.
Everything is lined up with the holes.  A friend pounded the old pins out to try to fix a lean in the front sight that caused my rear A2 sight to be adjusted all the way out for windage.
I am thinking maybe the front sight pins I ordered from Brownells are the "oversized"
I cant mic them at this point because they mushroomed out and I had to pound them back out.
I had them in right but they will not budge.  Used a punch and hammer.



You and your freind are messing up.

Doublestar barrels do in fact use straight pins.
Lets hope you did not foul up the FSb pin holes.

I would have checked for any gap in the index pin slot. If there is a very small shim/spacer will fix this problem.
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