R700 M16 Extractor cut. 30 or 45°?

[GenePoole]

A friend want's me to look into converting his R700 bolt to a M16 type extractor. I've never done one, so I ordered one from Midway (Badger Ordnance) and when it arrived, I set about researching the cut.

The Badger came with a blueprint and instructions that said to cut the slot at 30° to the bolt lug flats, so I was going to come up with a fixture to hold the bolt, and decided to search online for some ideas. Turns out Brownells sells one:

https://www.brownells.com/gunsmith-...=Avantlink&utm_content=NA&utm_campaign=Itwine

and PTG also sells one:

http://pacifictoolandgauge.com/remington-tools/9864-m16-sako-extractor-milling-jig.html

The PTG has a link to a instructions here:

https://pacifictoolandgauge.com/index.php?controller=attachment&id_attachment=13

but they show a 45° angle. If you download the PDF and check the angle shown with a protractor, it is about 30° though. The picture of the PTG sure looks like 45°. I decided to check it out in CAD (I didn't do the full cut, but the width and depth are right). The 45° cut removes a substantial amount from the bolt lug. The 30° cut looks more like what I've seen in aftermarket bolts--even PTG bolts.

Is PTG wrong about this or what gives? Anybody have either of these fixtures? Anybody do many of these?


CAD rendering of 45° cut:

CAD rendering of 30° cut:

 

[carlsbad]

30.

 

[carlsbad]

PS I have the Brownells fixture, used it last week. Works like a champ. No experience with PTG fixture. --Jerry

 

[boltfluter]

All I have done have been at 30 deg. But, have considered trying one at 35 deg. to give a lower ejection angle. As usual PTG is a joke when it comes to support for their own products. Badger instructions are what I have used with their M16 extractor as well. Nice solid model drawings.

Paul

 

[msalm]

If you use the mini extractor which is a bit narrower, then you might be at that 45 degree measurement. The large (wide) m16 style would be 30 degrees. Ejection angle is the biggest problem with the large extractor and less angle, you may have to remove the upper portion of the hook in order to effectively lower the ejection to keep from striking the optics.

 

[boltfluter]

When I use the Mini-M16 kit (all I use anymore) I do mine at 36 degrees. Right up against the lug but does not remove any of the lug. A win win in my book! And the slightly lower angle of ejection is an added bonus.
Paul

 

[LVLAaron]

When I use the Mini-M16 kit (all I use anymore) I do mine at 36 degrees. Right up against the lug but does not remove any of the lug. A win win in my book! And the slightly lower angle of ejection is an added bonus.
Paul

Whose kit do you use?

 

[skeetlee]

depending on your set up jig just hit the angle anywhere from 30 to 35 and you will be just fine. feel free to call if you need any assistance
Lee Gardner 217 246 0787

 

[msalm]

If using the wide extractor, it helps to mill off the top third of the hook to lower the ejection angle a bit. I like the narrow extractors better for the ejection angle improvement.

 

[buckhunter62]

Why would you want to weaken the strongest bolt made? I have put some in on my own rifles. Never again after I had a 40X blow up with a Sako extractor. It spit right where the cut is. You could see the firing pin & spring . I had to cut the bolt up with a carbide end mill to get it out of the rifle. I think you are better off keeping Remington's three rings of steel..