JP Rifles Thermo Fit Upper Receivers ( AR15 )

[GSS]

Anyone ever use one or any of the JP Rifles "Thermo Fit" Upper receivers?

If yes, I am interested in some 1st Hand feedback on how the build went for assembly, how well it shot and re-barreling experiences?

Here is the ( bit long winded but nice detail ) video showing the product and the process

I have all the receivers and barrels I need for anything I'm building ( service rifle ) or re barreling in the next year or two but I can't seem to find these ( smaller than typical ID ) Thermo Fit receivers on their website anywhere.

If anyone sees them on the website please guide me to them or post a link.
https://www.jprifles.com/

Probably looked right at it and didn't see it but wondering what premium they charge for these non standard "Thermo Fit" Receivers.

As discussed in countless other threads and posts there are numerous ways to tighten the fit in this area and some believe play in that area doesn't matter one bit. No real need or desire to rehash all that again.

I haven't seen these JP Thermo units discussed here anywhere so figured I'd start a thread about them.

Shims in this area are another way to accomplish tightening up this area if one wants to continue using upper receivers they already own. I only bring that up as applying a little heat to the receiver like they did in the JP video above would likely make sliding the parts together if using shims than it looks in this video

So,
I'm interested to learn what these JP Custom Thermo Receivers sell for and it anyone here has used them and can share their thoughts from 1st hand experience using them.

I have 3 uppers assembles and two spare flat top upper receivers on the shelf so I'm not in the market currently...

BUT, If I was in the market for a new upper receiver and they don't want crazy EXTRA money for these i would probably buy one.

Thanks, George

 

[paperpuncher]

What about a bigger od on the barrel ext.
I think bat makes custom od extensions

 

[GSS]

What about a bigger od on the barrel ext.
I think bat makes custom od extensions

Yes, Those are BAT extensions
https://www.batmachine.com/product/barrel-extension-ar15/

Thank You but,,,
Those fall under the multitude of other ways that I mentioned that have been heavily discussed to solve this real or imagined area of improvement.

As I tried to explain in my opening post;
In this thread,,, I'm hoping for 1st hand experiences using the JP rifles Thermo Fit system / method

I don't know how new these Thermo Fit Receivers are from JP so it could be possible that nobody here has used them yet and this thread will get no "Usefull" 1st hand experience replies.

Or, Maybe~
Someone will see this thread that is in the market for a new upper receiver for a build for an AR they hope to get good accuracy from at least out to 200 yards and will buy one of these JP receivers, do a build with it and report back.

Preferably / Hopefully an AR15 based Match Rifle or Service Rifle shooter that shoots in matches out to 600 yards vs a short barrel zombie / just havin fun beer can blaster...

 

[paperpuncher]

Wasnt trying to muddy your thread simply wanted to point out if you were going to pursue an interference fit like JP you could get an oversize extension and use the uppers and barrels you already have Good luck

 

[GSS]

Update,
I emailed JP and they currently only offer this technology / option in Receivers for .308 uppers

Cost is $450 for stripped upper (OUCH !! )
https://jprifles.com/buy.php?item=LTC19UR

Looks like Shims (heating the receiver to make for easier slip over shims fit) and Loctite products are the simple/ cost effective "go to options" remaining we all know about.

Then BAT extensions that aren't really TYPICALLY a home / hobby gunsmith install but is still an option.


Bummer wasn't what I had hoped would come of this thread but
Hopefully info here helped someone.
George

 

[captain23steve]

Bravo Company . Don't have any first hand experience with them, but I am going to use one in the near future.
https://bravocompanyusa.com/bcm-m4-upper-receiver-assembly-w-laser-t-markings/

 

[GSS]

Bravo Company . Don't have any first hand experience with them, but I am going to use one in the near future.
https://bravocompanyusa.com/bcm-m4-upper-receiver-assembly-w-laser-t-markings/

Nice Thanks,
Looks like those are designed like the JP Thermo fit with a smaller opening for the barrel extension so they have to be heated up to go onto the Extension?


https://bravocompanyusa.com/bcm-m4-upper-receiver-assembly-w-laser-t-markings/
Built to the correct Mil-Specs
(Inside Diameter for barrel extension slightly undersized for a tighter fit to the barrel and a more accurate rifle. Please use a heat gun or hair dryer to warm up threaded bore of receiver if barrel extension is too tight.)

Please let us know how tight of a fit it will be when you get it and what barrel you use.

 

[natdscott]

You do not need JP, you need ammo for the $200 difference. JP's ad department has found a cool niche, and kudos to them for it; it doesn't make it special in the function department.

I used a BCM with my last barrel install, with a slightly oversize extension (I think it was about 0.001" interference), and that barrel was so tight when I got it seated that you'd have had to cut the receiver ring to get it out. Not kidding at all.

I froze the barrel, and heated the receiver, and it still required a 2x4 on the floor, and a rubber mallet on the back.

No loctite or BS shims need apply, because there warn't no space for either one.

Shot like that burning house thing everybody talks about.

-Nate

 

[jepp2]

I used a BCM with my last barrel install, with a slightly oversize extension (I think it was about 0.001" interference), and that barrel was so tight when I got it seated that you'd have had to cut the receiver ring to get it out. Not kidding at all.

I have used several of the BCM upper receivers. Most were purchased as complete uppers and I broke them down. No problems getting the barrels removed. They do fit tighter than other upper receivers. The main issue I have had is my lap is very tight in the upper when lapping the face. Beyond that, installing barrels and removing them wasn't an issue.

 

[wwbrown]

JP says their ARs are as accurate as bolt guns, if this was true why don't you see ARs compete along side bolt guns in comps where accuracy counts, F-Class, Benchrest, and PRS. PRS would seem to be the competition where you would see ARs right along side bolts if ARs were as accurate as bolts.

Has JP ever shown that their ARs are as accurate as a precision bolt gun, not just once but multiple times?

I am not bashing ARs I have some and I also have precision bolt guns, ARs definitely have their place in the arsenal but I seriously doubt they will up against a true precision bolt.

 

[GSS]

JP says their ARs are as accurate as bolt guns, if this was true why don't you see ARs compete along side bolt guns in comps where accuracy counts, F-Class, Benchrest, and PRS. PRS would seem to be the competition where you would see ARs right along side bolts if ARs were as accurate as bolts.

Has JP ever shown that their ARs are as accurate as a precision bolt gun, not just once but multiple times?

I am not bashing ARs I have some and I also have precision bolt guns, ARs definitely have their place in the arsenal but I seriously doubt they will up against a true precision bolt.

Sorry a little humor,,,
Are these Rhetorical Questions regarding the hype advertising statement or are you serious

 

[GSS]

You do not need JP, you need ammo for the $200 difference. JP's ad department has found a cool niche, and kudos to them for it; it doesn't make it special in the function department.

I used a BCM with my last barrel install, with a slightly oversize extension (I think it was about 0.001" interference), and that barrel was so tight when I got it seated that you'd have had to cut the receiver ring to get it out. Not kidding at all.

I froze the barrel, and heated the receiver, and it still required a 2x4 on the floor, and a rubber mallet on the back.

No loctite or BS shims need apply, because there warn't no space for either one.

Shot like that burning house thing everybody talks about.

-Nate

Hi Nate,
Good to see a highly accomplished service rifle shooter like yourself went to the couple extra steps to get a tight fit in that area and the rifle shot great. You wouldn't have done it if you didn't think there was a chance it could help.

All Service Rifle shooters know this game is more about the Archer than the arrow but good / accurate equipment certainly doesn't hurt.

The debate will go on forever regarding if being tight in that area helps accuracy or not but it certainly won't hurt the way it shoots.

Thanks for sharing your direct experience on using that upper.
George

 

[wwbrown]

A little of each, I very much doubt the claim but I am not all knowing so I ask.

But mainly to throw a BS flag, I hate claims like this as I hear them from JP employees but no one puts up when asked to. JP is local to me, they make quality stuff at a serious price, as evidenced above.

 

[natdscott]

JP says their ARs are as accurate as bolt guns, if this was true why don't you see ARs compete along side bolt guns in comps where accuracy counts, F-Class, Benchrest, and PRS. PRS would seem to be the competition where you would see ARs right along side bolts if ARs were as accurate as bolts.

Has JP ever shown that their ARs are as accurate as a precision bolt gun, not just once but multiple times?

I am not bashing ARs I have some and I also have precision bolt guns, ARs definitely have their place in the arsenal but I seriously doubt they will up against a true precision bolt.

They generally aren't. I doubt there's an AR in the world that can agg in the teens or just over, day-in and day-out. Then again, the shooters that can do that aren't shooting AR rifles either...

I have personally handled an AR that I feel was capable of 1/4 Minute. It was crazy good, and it was what you'd expect...16" Heavy 7.7" Krieger setup by Holliger with a CLE chamber, running fairly top-shelf handloads.

That said, that was only one rifle. Then again, I've paid for, and owned, at least 2, and probably 3 uppers that were VERY much 1/2 Minute, and the most recent is 3/8 Minute. I say "maybe 3" because one of those is an A2, and I've only been able to break 1/2 MOA with it for several targets on one day, because....well shit. It IS an A2... sue me.

Common points:

--ALL of those were fired with the same 4.8 lb Geissele HSNM, and all on the same A2-stocked lower. That's not an impediment because I'm close to 15,000 cycles on that trigger.
--None of them were "JP" or large-shop rifles. They're from the likes of CLE, WOP, and Keystone Accuracy, with the very best steel that the "Big 2" Wisconsin cut-makers can cut.
--None of those groups were factory ammo. Screw that.

Can the AR compete in PRS..hell no. It's not enough cartridge unless you are inside 300.

Can a good shooter approach 1/2 Minute in actual match conditions? Yep.

Can most bolt gun shooters hammer with an AR? Nope. They aren't consistent enough on the gun to make an AR shoot like that. Tough love...but it's true.


-Nate

 

[GSS]

A little of each, I very much doubt the claim but I am not all knowing so I ask.

But mainly to throw a BS flag, I hate claims like this as I hear them from JP employees but no one puts up when asked to. JP is local to me, they make quality stuff at a serious price, as evidenced above.

This will probably take this thread down a rathole but...

The online debate on that topic will go on forever and will never die.
This thread alone could go 50 pages on it.

You are in a great spot if you are local to them.
You could approach them to have them make another you tube video of them having one of their best shooters go side to side with one of their AR's against you and your best bolt gun and let the video / results decide it for all to see.

My money would be on you and your bolt gun unless you both had to shoot prone from a sling.
Then the best shooter would win.

I would love to see you do that and have a dedicated thread for it that could be bookmarked for easy future reference.

 

[natdscott]

Hi Nate,
Good to see a highly accomplished service rifle shooter like yourself went to the couple extra steps to get a tight fit in that area and the rifle shot great. You wouldn't have done it if you didn't think there was a chance it could help.

All Service Rifle shooters know this game is more about the Archer than the arrow but good / accurate equipment certainly doesn't hurt.

The debate will go on forever regarding if being tight in that area helps accuracy or not but it certainly won't hurt the way it shoots.

Thanks for sharing your direct experience on using that upper.
George

Yeah, that upper was actually a Keystone .22LR. It was an A2 that I converted to A4 to scope it.

With a T16 El Paso, that rifle was under a 1/2 Minute gun at 50. Shilen Ratchet Supermatch finished at about 23.5", my own reamer....you get the idea.

No way was that barrel moving. Ever.


-Nate

 

[GSS]

I have used several of the BCM upper receivers. Most were purchased as complete uppers and I broke them down.
No problems getting the barrels removed. They do fit tighter than other upper receivers.

The main issue I have had is my lap is very tight in the upper when lapping the face.

Beyond that, installing barrels and removing them wasn't an issue.

Jepp2, Thanks for posting the 1st hand info .

You bring up an excellent point about those that prefer to use a receiver face lapping tool so they can at least check to see if the face is square would be SOL in an upper receiver that the lapping tool can't fit into to do it's job.

I recently bought the tool and i did plan on using it to at least check to see if the face is true and lapping only on receivers that need it

Great Point, Thanks again
George

 

[atblis]

BCM tightened up their receivers a few years ago. They weren't always that way. Those noting that in their experience the BCMs aren't any tighter might be using older receivers. I've had to use a heat gun on the last couple I used. Of course it all depends on the extension...

 

[Gappmast]

What about a bigger od on the barrel ext.
I think bat makes custom od extensions

I did this 4 years ago. Bat made me a +.003 barrel extension. I honed the receiver to a .0003" interference and put the receiver in the oven at 175 degrees. It slip in and after ten seconds was tight and would not move. It shoots very well.

 

[paperpuncher]

I did this 4 years ago. Bat made me a +.003 barrel extension. I honed the receiver to a .0003" interference and put the receiver in the oven at 175 degrees. It slip in and after ten seconds was tight and would not move. It shoots very well.

I saw a post yesterday on another forum that BAT will no longer offer ar extensions once the existing inventory is depleted