Home Forums Hunting & Shooting AR and Tactical Rifles AR front pivot pin stuck detent removal

Drill a small drain hole in the back end of the the channel. With a fairly tight fit and just a bit of oil it may be creating a vacuum behind it when it tries to come out by tapping it on something, etc. Then you could use air to blow it out.

Does anyone make a threaded pin that works without a detent? Wouldn't be as handy but saves you from tossing that receiver.

Try acetone flushing using a small syringe type tip while holding the lower with the hole down..........that will flush any residual oil out that is holding it, then dry it with air & try tapping it out or try the magnet again.

If that doesn't work, just use the short spring method.

MM

If all else fails try to find a screw type pin like Colt used on the SP-1’s.

Just don’t get the later type that were for large pin conversions.

I think you have the first pin stuck only part way down the raceway hole for it.

The detent spring is 1.03 inches in length, and the detent pin is .324 ~ish in length.

If the spring compresses 50%, and that’s generous - that’s at least .500 plus .324 for .824 needed to install the spring and pin.

Two pins shouldn’t be more than .648 - in length, so if the second pin isn’t able to go in the hole, the first pin isn’t fully seated at the end of it’s raceway.

The raceway should be .965-.985 in length - leaving room for a short spring between the two detent pins.

This is what I was describing before.
https://www.specializedarmament.com...ivot-pin-assembly-small-0.250-two-piece/

If that is correct it must have two detent pins in it; one put in before I bought it “new” at a gun show and the one I’m responsible for. That kinda makes sense as the spring didn’t want to compress enough for installation even with the installation tool. I was having a very hard time with it.

With what should be 1 pin in it I can’t push the pin in any further, that is with a punch and brass hammer tapping it as hard as I’m comfortable with. I bet it had a pin in it when I bought it. Will try the drill bit / epoxy option and if that don’t work the threaded take down pin may be a good option. I don’t plan to separate upper / lower often. This was planned to be a lightweight 6.5 G deer rifle with 16” Faxon Gunner profile barrel.

Thanks for all the ideas. I appreciate it!

No need to buy a whole new lower. If you absolutely just can't get it out, here's a few things you could do to salvage it.

Option 1
Seat the detent as far back as possible. It's OK to use a hammer and drive it on in. Shorten the spring, buy new detent and still use the lower.

Option 2
KNS Precision Enhanced Takedown Pin