I’ve read how I can rivet in a new one myself, or do a Sako conversion, not interested.
It is frustrating dealing with brand names. In print shills make you think there is some sort of historical continuity between Rem1.0 and Rem 2.0, but the fact is, Rem 2.0 is a totally new entity, and does not accept any of the liability from the old organization. Rem 2.0 wants you to buy new, Rem 2.0 products. So, it is not in their economic interest to offer parts for Rem 1.0 models. Rem 3.0 will do the same thing, and this is an endless cycle.
I have a Rem M721 and I purchased an extra bolt with a SAKO extractor conversion. Installing the bolt, I noticed that there is nothing preventing the extractor from blowing out of the receiver ring, given a large enough gas leak. Based on the number of reports of shooters who lost eyeballs with SAKO extractor conversions, I know the SAKO type extractor will blow out right into the shooter's eye. I have looked where that extractor is, and there is absolutely nothing supporting it, or keeping it put.
And that is the same for an M16 extractor. The market is now offering M16 extractor conversions, and lots of people are buying, because the M16 extractor is "Mil Spec". Well it is mil spec in an AR15/M16. It is not a mil spec application in a Rem 700 bolt face, and I am very skeptical that the things will stay in, any better than the SAKO extractor, given enough gas release.
Lets look at the mil spec application:this is an AR15 bolt, the extractor held in place by a pin
this is the bolt in the bolt carrier
bolt in battery
no barrel extension to hide a fully forward bolt inside ring of upper, so you can see something is behind the extractor when the bolt is in battery.
bolt in locked configuration, inside bolt carrier
With Stoner's design, the extractor body is well inside the carrier, and the part of the extractor in the barrel extension is well supported. Only a little bit is between the carrier and extension when the lugs are in engagement. And the extractor is not orientated toward the ejection port. This extractor in its original useage, is going to be very hard to blow out of an AR15 if there is a massive gas release. (But, never say never)
There are lots of bad kabooms where a M16/AR15 bolt head is cracked apart and the extractor blew out, but short of extreme events, an M16 extractor is going to stay inside the gun.
Look Ma! No carrier! This is a blowup picture from the web. I have no idea why the extractor stayed in, once the carrier disappeared. But, I will bet, without a carrier, that extractor would have taken off, first thing.
Yes the M16 extractor may be military, but those M700 bolt face conversions are using that extractor very differently from Stoner's military rifle. Stoner's rifle provided a lot of support for that extractor. But, some believe, that just because something is "Mil Spec", that makes it magic.
Take a military claw hammer and an identical civilian claw hammer and hit yourself in the head with both. Feel any magic with the military claw hammer.? Probably not.
I don't have a M700 with a M16 extractor, but I don't see anything other than some small cross pin keeping it in place in a M700 bolt. Just like the SAKO extractor, it is right in line with the right receiver bolt lug opening, with nothing but air above. And I am going to say, until I see some real test evidence that cross pin will keep that extractor from blowing out of a M700 receiver ring, I have no desire to install one on a M700 bolt. Mike Walker designed one of the strongest, safest actions, the trade off was, a dinky, puny little extractor that wears.
And central to his design was the three rings that encircle the case head.
Before I would install anyone's SAKO, M16, extractors, I would find an original M700 extractor, and put that in. It is not worth risking an eyeball based on a bunch unsubstantiated safety claims by gunsmiths making SAKO and M16 extractor conversions. And if you have to pay a gunsmith to have it installed, pay the gunsmith.
And, keep the space between the extractor and bolt face clean. And, don't load super hot loads that expand the case head, as that will break the extractor blade. And, don't create reloads that create sticky extraction. Sticky extraction will stress the extractor as it wrenches a case out of the chamber. The Remington extractor is a tiny piece of steel, it will break in time, the more you stress it, the sooner it will break. It is far better to have the fired case fall out of the chamber, and use the extractor only to push the case head against the side of the bolt face.