I have a Colt AR-15 on the boards for sale and Someone brought my attention to something I had not noticed. A friend thinks this is a possible large hole lower made by Colt. It is an older receiver #sp23157 which was sent to Olympic arms and had an HBAR barrel put on it. When it was returned, there was a bolt with a stainless steel sleeve where normally there is a pin. The hole seems larger than where the normal pin would fit. The gun functions fine and has had about 1000 rounds through it. I really dont need the gun but kind of bought it as a favor. I am thinking of just selling the lower and putting a non-colt lower on it.

I am not sure how to list the lower correctly without someone getting something they cant use. I basically need info on the gun and what I have, is it a bastardized fix from Olympic or is this normal?
Pics attached. Thanks Kerry
i8.photobucket.com/albums/a27/whitsdeals4u/DSCN1573.jpg
i8.photobucket.com/albums/a27/whitsdeals4u/DSCN1570.jpg
i8.photobucket.com/albums/a27/whitsdeals4u/DSCN1574.jpg
i8.photobucket.com/albums/a27/whitsdeals4u/DSCN1486.jpg

Looks like an ordinary SP1 rifle with a damn goofy pin, I would bet Olympic did'nt have the pin it needed, the question is why did they replace the original pin with that one

It is about 1/8". It is a bolt and a nut fastens it on the other end, but there is a stainless steel sleeve over the bolt part that makes it function as a pin.

Doesn't look like a stock hinge.

My SP1 has a bolt on it there with a screw head (flathead).  I bought it from my uncle and it's never been out of the house for any work.

Send an IM if you need a picture.

R.

this is what an original should look like

Quoted: this is what an original should look like pic11.picturetrail.com/VOL366/498052/6460528/85349857.jpg pic11.picturetrail.com/VOL366/498052/6460528/85349268.jpg

This is exactly what mine looks like.



R.

ETA - photo

It's an SP1 lower - so just advertise it as such.

Replacement pins are easily available - either for large hole uppers or the eccentric pin to use
small hole uppers.

Quoted: Quoted: This is exactly what mine looks like. i13.photobucket.com/albums/a264/artweaker/Troubleshooting/pin_side.jpg i13.photobucket.com/albums/a264/artweaker/Troubleshooting/SP1left_crop.jpg i13.photobucket.com/albums/a264/artweaker/Troubleshooting/pin_side2.jpg

BTT with new picture in previous post.

R.

Yeah, your's is different than his.

Your original Colt pin has a slot headed screw that fits INTO a hollow, threaded sleeve. With a slotted head on it, too.

UTVOLS looks like an Allen headed screw was turned to diameter with just the end threaded. Then a hex nut was used for the other side. Completely different from what Colt ever used.