The JR Carbine Thread

Have you tried using a flathead screwdriver and a hammer to loosen the jam nut? You just put the screwdriver in one of the slots and tap it with the hammer...it will loosen and tighten, but you just have to be careful that you don't scratch it up. For the barrel nut, you will need an actual wrench.

I used a generic AR wrench from NcStar on the barrel nut and a Midwest Industries jam nut wrench on the jam nut. Any will do, it's fairly generic. Now that I have the quick takedown tube from JRC...it's even better. I don't need any tools to quickly take down my rifle and it packs down to less than 25"! :)
 
Allstone said:
Have you tried using a flathead screwdriver and a hammer to loosen the jam nut? You just put the screwdriver in one of the slots and tap it with the hammer...it will loosen and tighten, but you just have to be careful that you don't scratch it up. For the barrel nut, you will need an actual wrench.

I used a generic AR wrench from NcStar on the barrel nut and a Midwest Industries jam nut wrench on the jam nut. Any will do, it's fairly generic....
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^^^ This ^^^
I had no problem using a hammer and large steel punch to loosen that ring. A brass punch would be better but if you are careful, the steel one (or screwdriver) works fine. You could always use an empty case over the end as an improvised "brass tip".

You are going to need a wrench at some point anyway, so just pony up and order one online.
I found a standard AR stock wrench in the EE here, and just ordered the armorer's tool which should be here any day for under 40 bucks to finish my fore end swap.
 
before I got a tool I used some emery cloth wrapped arounf nut and channel lock pliers, they are not tight, if too tight it must distort the tube and the action does not run smoothly
 
Smokestack..you do love typing don't you ? LOL

I'm a little confused as to your trouble with the fore end. Are you sure you are trying to turn it the right way ?
How are you getting streaks on the fore end ? You should only be hitting the notch in the ring.

Yes, the take down could be a lot easier BUT...you don't have to do a complete strip every 200-300 rounds either.
Given a blast of cleaner and G96 after each trip out it will keep going fine. When you have the time at home, then you can tear it right down and scrub every nook 'n cranny nice and clean. Unless your trigger is acting up, there is no reason to drop the lower in the field anyway as just removing the buffer tube allows complete access to the bolt and chamber areas.
I carry the castle nut wrench in my range bag, just in case I need to do that.

I do have a concern about the possibility of over torquing the screws and stripping (or cross threading) the threads, pins would definitely be far superior.
But, all the more reason to leave that chore until I'm at home and not rushed.

**as I was typing this the AR wrench just showed up...gotta go install my new (to me) rail !


Edit: Ok, the barrel nut was frickin' tight ! Maybe the guy who installed it also did the jam nut on your fore end !! LOL
 
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st1264 said:
Quick takedown tube? Tell us more! How much and how does it work?
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My .45 JRC assembled...(now wears a new Aimpoint PRO that I just bought).


The barrel nut and shroud are basically integrated together in the take down tube...there are holes closest to the receiver and they supply a small pin that you can insert to tighten or loosen the tube. I store this in the compartment of the MOE grip. Ten seconds to spin off the tube and you can break down the rifle into three pieces...the rifle case in the picture is a UTG 25" case and the barrel fits perfectly in the front pocket while the receiver and tube can be well secured inside with the Velcro straps provided with the case.


Got it for $60 on JRC's site (looks like price may have gone up?), and the usual shipping of $14.50 to Canada...USD. It arrived in about ten days via Canada Post, no additional taxes or fees involved...about $85 CDN all said and done.

Here's a short video of how the tube works...
https://www.youtube.com/watch?v=fkB3H6S6c70&feature=player_embedded


http://shop.justrightcarbines.com/Takedown-Tube-Takedown.htm
 
woohoo got my wrench and tube yesterday too!
I now have a front rail that isn't loose and cockeyed...
It helps to put the gun in a vise to loosen and tighten up those nuts.
 
st1264 said:
So no "quick take down" for the buttstock and tube... Doesn't appear that JR sells new castle nuts.
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Hopefully one day they come up with something for the rear end. Thats the one that has to come off in order to clean the thing. You're gonna be taking the buffer assy off/apart a lot more often than the barrel.
 
I just ordered the Bolt Handle assembly, JR tool & Takedown tube. $108 US w/shipping. I asked to buy (hopefully they just give them to me) the 2 castle nuts. Will see.
 
st1264 said:
I just ordered the Bolt Handle assembly, JR tool & Takedown tube. $108 US w/shipping. I asked to buy (hopefully they just give them to me) the 2 castle nuts. Will see.
Click to expand...

The take down tube is a pretty cool idea especially for storing in a boat or RV.
The rifle uses standard AR buffer tube / castle nuts, one of the vendors here must carry 'em if you need extras.
Why the extra bolt handle ?

Had my JR at the range today and not only does it look better now (with the 12" rail), it also handles better.
 
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