Anyone seen this on back of Receiver?

[USGI]

I've got just one Inland with an SG marked receiver. Had it almost 9 years now and never did anything with it other than pull the action out of the Winchester stock briefly. Wanted to check on the TH group and OP slide to see if they looked "right" - it's pretty easy to get to, so maybe tomorrow will pull it out of the safe and see if it's got a dimple at the back. I doubt it will, or the former owner would have posted about it here on the forum. - Bob

[W5USMC]

To big, way to deep

I think it was the owner who stated:
"For reference, it is a SG subcontracted Inland receiver. The dimple is very shallow and perfectly centered."

[eb in oregon]

I think it was the owner who stated:
"For reference, it is a SG subcontracted Inland receiver. The dimple is very shallow and perfectly centered."

"Shallow" is subjective. Viewing the picture the "dimple" appears about as deep as large in diameter. No punch or ball peen strike can physically do that. Both tools displace material around the strike. A ball mill will, but it cuts and there is no indication of material displacement around that dimple. Merely the opinion of a guy that spent 25 plus years working with and machining metal.

[jond41403]

I agree Eb for the most part but most of the hardness test dimples I have seen on carbine receivers are usually on the back of the receiver in front of the rear sight. I have never seen one where this dimple is above the tang but I thought maybe a first time for everything haha. Or am I confusing a hardness test dimple with a proof firing dimple?

[W5USMC]

Additional pictures in the CCC link below.
Dimpled Receiver? - The Carbine Collector's Club

[painter777]

Finish is believed to be the original Park. Thoughts now leaning toward this impression having been left during Pre-Finish. Could it have been a impression left from a Vice or other Clamping device?
Just trying to help a Member.

http://www.uscarbinecal30.com/forum/...78/dimple1.jpg

http://www.uscarbinecal30.com/forum/...78/dimple2.jpg

http://www.uscarbinecal30.com/forum/...78/dimple3.jpg

http://www.uscarbinecal30.com/forum/...78/dimple4.jpg

http://www.uscarbinecal30.com/forum/...78/dimple5.jpg

Wayne, Same idea, I was a little late but am going to go ahead and post.

[eb in oregon]

I expressed an opinion based on real life experience. You guys can go ahead and debate it to death, I've nothing more to offer.

[jond41403]

I expressed an opinion based on real life experience. You guys can go ahead and debate it to death, I've nothing more to offer.

Could it have been a defect like you said in your first post but they drilled it out before finishing? I'm not familiar at all with working with metal but if there was a crater or small void(small pocket) there that was not a uniform shape, could they have drilled it to create a perfect circle so no cracks would appear from the bolt slamming back repeatedly? I'm just wondering if they did that to prevent future cracking. I know the back is not an area prone to cracking but with a crater back there, I didn't know if it was a possibility. I'm not refuting your experience with metal at all, I know you definitely know what you're talking about, I'm just trying to learn.thanks

[USGI]

I was a little late but am going to go ahead and post.

Well, I'm a little late too - nice day here yesterday for a change and I worked outside most of the day. Did take that Inland out of the safe last night and have a couple pictures. Don't think I ever had the action out of the stock before though, believe I would have counted the coils for the hammer spring first thing. Question for those knowing more about these SG receivers than me, how come mine has a narrow tang? My receiver does have a small hardness test mark on the RH side directly behind the operating slide channel. JD, the punch mark ahead of the rear sight is placed after test firing of the carbine. - Bob

[jond41403]

Thanks Bob, after I posted it I started thinking that I probably had them confused. So hardness tests will always be on the side of the receiver near the stress points just like Eb said. I noticed hammer grunts early inland had those marks on the side of his receiver as well.