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Posted: 9/25/2005 6:47:18 PM EDT
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
Link Posted: 9/25/2005 7:11:38 PM EDT
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
Link Posted: 9/25/2005 7:20:50 PM EDT
Link Posted: 9/25/2005 7:35:06 PM EDT
[Last Edit: 9/25/2005 7:35:31 PM EDT by UTVOLS]
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.
Link Posted: 9/25/2005 11:32:54 PM EDT
[Last Edit: 9/25/2005 11:33:22 PM EDT by Tweak]
Link Posted: 9/26/2005 8:43:01 AM EDT
Doesn't look like a stock hinge.
Link Posted: 9/26/2005 9:17:46 AM EDT
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.

Link Posted: 9/26/2005 4:46:33 PM EDT
Link Posted: 9/26/2005 5:14:45 PM EDT
this is what an original should look like

Link Posted: 9/26/2005 5:21:28 PM EDT
Link Posted: 9/26/2005 5:51:19 PM EDT
[Last Edit: 9/27/2005 7:56:59 AM EDT by freemanesq]

Originally Posted By YardDogOne:
this is what an original should look like



This is exactly what mine looks like.


ETA - photo
Link Posted: 9/26/2005 6:04:45 PM EDT
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.
Link Posted: 9/26/2005 7:51:30 PM EDT
[Last Edit: 9/27/2005 3:26:33 PM EDT by Tweak]
Link Posted: 9/27/2005 7:58:05 AM EDT
Link Posted: 9/27/2005 10:35:51 AM EDT
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.

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