JR Carbine - Gun, Ammo or Me? *BIG PICS*
- Thread starter geclark
- Start date
So - I went through a couple of boxes of factory .45 yesterday, and it faired worse than the reloads.
Good news - the DD Rail felt great, and showed no signs of having a problem. Still going to do some work on it to get the top 2 bolts reversed.
Gun as configured now:
Ammo as configured now:
The JR punched neat little squares into a few of the rounds, and also mangled the rims on most of the cartridges. It seems like round 1, 8,9 & 10 are the most problematic. Round 1 frequently won't chamber and 8-10 are where the more drastic brass manglings occur (as other posters have stated).
Have still not had it apart to check out the feed ramp, will be taking a peek this week though. It also does seem pretty accurate.
I find myself wondering how many of these issues exist with a 1911 fed JR. I still want to fix this one, but if going to the 1911 mag well would make this go away I'd be more than happy to do so if it were an option....
Last edited:
- Location
- Newmarket, Ontario
I picked up a JR Carbine in 9mm earlier this week .... got it out for a run at the range tonite, extremely happy and impressed !
Added a bipod, front vertical grip and Bushnell Trophy site .... this thing is unbelievably accurate at 75ft.
No issues or problems with the rifle.
Added a bipod, front vertical grip and Bushnell Trophy site .... this thing is unbelievably accurate at 75ft.
No issues or problems with the rifle.
What I was told from the fellow at Joe Brooks was that the longer barrel (compared to the pistol barrel for a .45) is causing higher velocities and the bolt is too light causing it to strip rounds off too violently. They are supposedly making a heavier bolt to slow it down. Not a lot of info but that is what they told me.
Also, I asked if I should return the rifle and they said to hold off on that. They are hoping to get the new bolts soon and would ship them out.
Hope this happens soon.
- Location
- Newmarket, Ontario
Buddy of mine has the .40 cal version and it has it's problems too. Took it back to Epps and they are making the necessary changes. I was there late this week with him, they said the parts are in and gun will be ready this week coming ... this is a little over 2 weeks after he dropped it off. So they can get the necessary parts, just takes a bit of time.
firestorm79
Regular
- Location
- Edmonton, AB
I just got a call from JR Carbines and was told cutting the rubber bumper to a OAL of 11/16" would fix the feeding problems (.45acp model). That is the conclusion they've come to after 2 weeks of troubleshooting.
I've already sent my rifle to Ellwood Epps so I have no way of testing and reporting on the solution.
I've already sent my rifle to Ellwood Epps so I have no way of testing and reporting on the solution.
Rifleman1911
CGN Regular
- Location
- Leduc county AB
N / M found the answer on pg 3 sorry.
Rifleman
Rifleman
I just spoke to the gunsmith at Elwood Epps regarding that fix. What they said was that shortening the spacer was a partial fix. He said that in some cases that was all they had to do but it doesn't work for every gun. He also said you should reverse the buffer spring in the tube before putting it back together.
I asked him what the other things were that needed to be done to complete the fix. He said he wasn't sure as they are experimenting with different things- some of which work and some don't. It seems to be gun specific as to what works.
I asked if shortening the spacer myself would affect the warranty. He said no, to go ahead and do it, but there was no guarantee that would necessarily solve the problem.
He also said that if that didn't work to send it in under warranty. There is a 3-4 week wait and no guarantee that it would be permanently fixed (at the moment as they don't really know what the problem is).
In fairness, I bought my gun from Joe Brooks and they have offered me a full refund including shipping if I want to return it. Just waiting to hear from them as they are in contact with JR in New York. They might have something concrete tomorrow. Got my fingers crossed but i am not optimistic at the moment.
I shortened my spacer and took it to the range with some different bullet types. It was somewhat better in terms of feeding but not much. The most I got was 7 rounds in a row with no ftf's. I did notice that the cases weren't chewed up nearly as much. Small chunk bent back at top of case mouth- no holes in side of case like before. 230 RN lead bullets seemed to work best of all but still nowhere near what it should be doing. I got seven in a row with Speer 185 gr. HP RN and Unique powder. It still hates lead SWC's. Can't get more than 2 in a row without a feed issue.
It has been suggested that gun break in is important. I just don't know how many rounds I am willing to sacrifice to get it broken in- and no guarantee it is going to get better. Sure hope Joe Brooks has something to say later on today.
modernworrior
CGN Regular
- Location
- Brampton On,
Any news ? I want one of these in the near future I can't justify a kriss.
Gun back from servicing
So - I finally gave up sent my JR off for warranty service 5 weeks ago and it came back last week. Receipt said fix 'feed issues'. The only obvious visible difference was the replacement of the original rubber bumper with a larger, non tapered bumper.
I loaded it up, grabbed 200 rounds of .45 and went to test it out!
Unfortunately I had ~20 failures in the first box, so didn't bother with the other 150. This was in stock form (which I find a bit lacking), but wanted to rule out all the junk I taped on as a factor. Since it was horribly broken in stock format, I put all the aftermarket goodies back on this weekend and went to do another test with a couple of different ammo times.
Wearing a UBR, and 14" DD-Lite rail it feels better balanced, but unfortunately still shoots pretty much the same.
I was shooting both S&B, and Wolf.
The S&B went rather poorly. 7/50 rounds destroyed, and another 12 not destructive failures to feed. A total of 19/50 failures.
The Wolf ammo actually went pretty well (for where my bar is at right now). Only 6 failures, 3 of which destroyed the rounds. Most satisfying was the fact I got through two 10 round magazines without any failure at all.
Failure types varied with the Wolf, with one punctured case and two rounds smashed back into the case.
It seems like ammo has a role to play, wondering if the Wolf ammo isn't as 'hot' as the S&B?
I'm also only using the original mag supplied with the JR, and wondering if that could be my problem. Not sure if they use the included mag when repairing the JR or a known good one at the shop.... When loaded with 10 rounds I find it rubs on the side of magwell, and I have a hard time both inserting it in the gun and bringing the bolt back to chamber the first round (feels like the bolt is scraping on the first round).
They made their announcement about the high performance springs being included in March, and I picked mine up in May - so theoretically should be installed?
Anyone know how to tell the high performance spring from the stock one? After the first set of testing I've opened the mag up, and the spring is installed as per the docs on their site. Anyways, going to try some different magazines next weekend to see if I can improve things.
In the mean time, and JRC folks in .45, still love to hear any tweaks you've done to make things work....
So - I finally gave up sent my JR off for warranty service 5 weeks ago and it came back last week. Receipt said fix 'feed issues'. The only obvious visible difference was the replacement of the original rubber bumper with a larger, non tapered bumper.
I loaded it up, grabbed 200 rounds of .45 and went to test it out!
Unfortunately I had ~20 failures in the first box, so didn't bother with the other 150. This was in stock form (which I find a bit lacking), but wanted to rule out all the junk I taped on as a factor. Since it was horribly broken in stock format, I put all the aftermarket goodies back on this weekend and went to do another test with a couple of different ammo times.
Wearing a UBR, and 14" DD-Lite rail it feels better balanced, but unfortunately still shoots pretty much the same.
I was shooting both S&B, and Wolf.
The S&B went rather poorly. 7/50 rounds destroyed, and another 12 not destructive failures to feed. A total of 19/50 failures.
The Wolf ammo actually went pretty well (for where my bar is at right now). Only 6 failures, 3 of which destroyed the rounds. Most satisfying was the fact I got through two 10 round magazines without any failure at all.
Failure types varied with the Wolf, with one punctured case and two rounds smashed back into the case.
It seems like ammo has a role to play, wondering if the Wolf ammo isn't as 'hot' as the S&B?
I'm also only using the original mag supplied with the JR, and wondering if that could be my problem. Not sure if they use the included mag when repairing the JR or a known good one at the shop.... When loaded with 10 rounds I find it rubs on the side of magwell, and I have a hard time both inserting it in the gun and bringing the bolt back to chamber the first round (feels like the bolt is scraping on the first round).
They made their announcement about the high performance springs being included in March, and I picked mine up in May - so theoretically should be installed?
Anyone know how to tell the high performance spring from the stock one? After the first set of testing I've opened the mag up, and the spring is installed as per the docs on their site. Anyways, going to try some different magazines next weekend to see if I can improve things.
In the mean time, and JRC folks in .45, still love to hear any tweaks you've done to make things work....
Last edited:
