Reached a setback in a Stag-10 22-250 project. WWJMBD

[Uisge]

So in my boredom working away from home I’ve taken on an oddball upper for my Stag 10. I found a barrel of relatively unknown origin here on the EE. After a few hurdles I got it torqued into my spare upper and ready for testing, and so far it’s not operational. The shorter, tapered, skinny projectiled, 22-250 is not playing nice with the feed ramps causing the tip of the bullet to impact the back of the barrel about 1/8” of an inch below the chamber and causing... you guessed it a setback. So far the only thing I can come up with would be to add material to the feed ramps to push the tip up that 1/8” to make it into the chamber. Anyone else have any ideas? My plan at the moment is to drop a small bead of weld into the ramp and reprofile it with a die grinder and or file. I had a thought to add a ramp to the barrel below the chamber (ala glock) but being a 65000psi cartridge I felt this may not be a good idea, I also considered pushing the feed ramps down to try and gain a better... approach angle? (Not sure what else to call it) and having a dedicated mag but felt this may be unreliable at best. Any and all suggestions and or insults will be considered. So I ask you all, what would John Moses Browning do?

Pictured taken in my safe space, with firing pin removed and barrel pointed in a safe direction.

 

[rifleman762]

Shoulder diameter is too small allowing the cartridge to point down. Rechamber it to a 22 Creedmoor and it should feed better .

 

[tiriaq]

Would it be possible to modify the magazine to allow the round to present at a different angle?
A .308 length magazine is way too long for a .22-.250. Perhaps that is where the problem lies.

 

[rifleman762]

There is a company making 22-250 AR10 rifles. They made a proprietary magazine to get it to feed. Alex Pro Firearms sells the magazine for $180 US.

 

[Sinasta]

This guy had the same issue.

https://www.canadiangunnutz.com/forum/showthread.php/1885052-Stag-10-Feeding-Issues

 

[Workin Man]

If you decide to add material to the feed ramps, I would start with epoxy instead of a weld. Epoxy will be easier to work with and not really permanent. If you can get it to feed by changing the profile, then you have sort of a pattern to go by when you weld it and do it for good. If it doesn't work out, the epoxy can be removed and no permanent damage has been done.

Jim

 

[jiffx2781]

There is a company making 22-250 AR10 rifles. They made a proprietary magazine to get it to feed. Alex Pro Firearms sells the magazine for $180 US.

Yup, APF makes the only dedicated 22-250 AR10 magazine on the market. IRG carries them but it's a pricey gamble to take when you don't know if it will solve your problem or not.

https://www.irunguns.com/magazines/standard-magazines/apf-mag-22-250-8rd-billet-alum-95

 

[45ACPKING]

looks like the front of the mag is ramping the rounds to where they should be..... perhaps a insert could be modified in to your existing mags

 

[Uisge]

Would it be possible to modify the magazine to allow the round to present at a different angle?
A .308 length magazine is way too long for a .22-.250. Perhaps that is where the problem lies.

I considered that, but was worried the taper would negate any change in geometry as the mag is loaded. What works for the last round may not fly with the rest. But I’m considering all options.

 

[scourge18a]

My Stag 10 barrels have a small taper of about 45 degrees on the beach face of the barrel.
That barrel looks to be a hard 90 degrees.
I would remove the barrel and talk to a gunsmith about machining a bevel on that barrel.
Or maybe talk to other AR barrel manufacturers about this and see what they would do.
Adding to the feed ramps will probably be a disaster.

Look at post #15 on the CGN thread linked above.
Just my 2 cents.

 

[Uisge]

So! After a minor set back, things are ramping up with my project. I added a shallow, and very steep ramp to the barrel using a conical burr and a drill held at a steep angle to get a less extreme cut angle. Took away small amount of material at time, then reassembled, tested, failed, repeat until on my last pass the bolt carrier just slipped right in. I assumed it was a fluke, so with firing pin removed etc, ran a full mag of 5 (p-mag 10) in and out without issue. Going to give it another good cleaning to get any shavings stuck in the extension out and tomorrow most likely will be a test. First round will be examined with calipers around the area of the ramp to look for bulging, etc. Then function testing will follow. Fingers crossed. I’ll keep you all posted.
Burr used

End result

 

[lone-wolf]

Hope it works out, I was wondering if a stag10 could be turned into a 22-250 coyote getter.

 

[jiffx2781]

^^^ I really don't see how that would cause any issue. Most barrels are chamfered the entire way around which leaves a small amount of the cartridge unsupported and I've never had a case blow up because of it.

But as always, proceed on the side of caution and inspect fired cases just to be sure.

I think you'll find that your problem is now solved.

 

[robab]

Complete Gun Repair in St John’s , NL built one recently and had it there for sale. Maybe a call to them could help if you have a question.

 

[Uisge]

Hope it works out, I was wondering if a stag10 could be turned into a 22-250 coyote getter.

That’s the plan! I’ll keep you posted.

 

[Sinasta]

What markings are on the barrel?

 

[Uisge]

What markings are on the barrel?

Believe it or not there are none, also the gas port is mid length and at the 1:00 o-clock postition, it takes an .800 gas block? Has a kinda rough integral pepper pot brake that really doesn’t like patches, and the barrel extension required the old hot-cold treatment and some mild violence to find its was into the receiver (receiver housed two separate barrels previously that slid right in and out). That all being said, it is in there, and after a look at the ejected rounds I’m confident it is in fact a 22-250. Going to use my cleaning rod to approximate a twist rate. I wanted a project, and I got it lol. I’ve adjusted the gas tube to work with the off set port, I’ll probably swap hand guards to something without windows to alleviate my OCD about the crooked gas port. That all being said, if it continues to feed reliably, and shoots decent I’ll be happy. I will most likely stamp or engrave the cal and twist in it myself. 22-250 ammo is cheap and readily available so it could be a lot of fun if I can get it to work. Has been my most challenging build to date!

 

[Sinasta]

Believe it or not there are none, also the gas port is mid length and at the 1:00 o-clock postition, it takes an .800 gas block? Has a kinda rough integral pepper pot brake that really doesn’t like patches, and the barrel extension required the old hot-cold treatment and some mild violence to find its was into the receiver (receiver housed two separate barrels previously that slid right in and out). That all being said, it is in there, and after a look at the ejected rounds I’m confident it is in fact a 22-250. Going to use my cleaning rod to approximate a twist rate. I wanted a project, and I got it lol. I’ve adjusted the gas tube to work with the off set port, I’ll probably swap hand guards to something without windows to alleviate my OCD about the crooked gas port. That all being said, if it continues to feed reliably, and shoots decent I’ll be happy. I will most likely stamp or engrave the cal and twist in it myself. 22-250 ammo is cheap and readily available so it could be a lot of fun if I can get it to work. Has been my most challenging build to date!

Nothing wrong with a oversized barrel extension. Wish some places offer it.

Good luck on your project and keep us updated.

 

[Uisge]

Nothing wrong with a oversized barrel extension. Wish some places offer it.

Good luck on your project and keep us updated.

Well, a little smaller would have been just fine, it may be in there permanently now. I prefer them to be snug, but it was more of a press fit, even with a cold barrel and hot receiver. No worry about shifting around in there! Just measured twist, approx 1-14” twist. Should be good for the 50 and 55gr pills I have to test with. Test results to follow.

 

[Sinasta]

Well, a little smaller would have been just fine, it may be in there permanently now. I prefer them to be snug, but it was more of a press fit, even with a cold barrel and hot receiver. No worry about shifting around in there! Just measured twist, approx 1-14” twist. Should be good for the 50 and 55gr pills I have to test with. Test results to follow.

Heat up the receiver threads again and take a 1" wooden dowel to knock it off with a mallet.