LaRue UU kit with Proof Barrel

[LongRangeAggie]

Has anyone tried to swap a Proof carbon barrel into a LaRue UU kit, specifically 260 rem? I researched the shit out of it and haven't gotten a straight answer. It seems that people have successfully done it with the PredatOBR but haven't heard of anyone doing it with the UU kits. I'm worried about it not fitting the ID of the handguard and the headspace.

 

[D46Infinity]

It will fit as the barrel extension is essentially the same and the hand guard fits around that. There is plenty of room under the hand guard for a pretty heavy barrel taper.
Just know you will probably have to use a different bolt and possibly a carrier to go with it. Most people who swap to different barrels have to use a different bolt to get them cycling and feeding correctly.

I can look at my UU kit and my buddies predatOBR ifyou need more help.

 

[FCS]

Has anyone tried to swap a Proof carbon barrel into a LaRue UU kit, specifically 260 rem? I researched the shit out of it and haven't gotten a straight answer. It seems that people have successfully done it with the PredatOBR but haven't heard of anyone doing it with the UU kits. I'm worried about it not fitting the ID of the handguard and the headspace.

I'd send a LaRue bolt to have head space set to that bolt so you can run one BCG. LaRue bolts I have are smaller FP so would work well for a 260 build.
Measure the ID of the receiver for barrel extension, pass that information on to whoever is doing the chamber job for Proof barrel.
There isn't a mil spec for -10s.
You'll want to make sure the OD of the barrel extension is compatible with the ID of the receiver.

 

[MSTN]

Proof Research barrels are set up to run with JP bolts as their benchmark. I'd strongly suggest getting yourself a JP High Pressure Bolt along with appropriate firing pin from JP for your .260 Remington application.

I've built up multiple custom big block AR's with Proof CFW barrels and the JP High Pressure Bolts. Never one single hiccup.

 

[LongRangeAggie]

Thanks for the replies, I will probably be swapping mine to a Proof here pretty soon and will post pics when I do. The damn thing is just so heavy.

Here's a pic of my 260 UU.

 

[RyanScott]

@MSTN if you have proof barrels and calipers handy what are the diameters of large and small frame barrel extensions?

 

[MSTN]

All out at the moment, with more of both on order. They don't stay here very long.

I can say they'e on the larger size, which is I feel a positive. Heat always needs to be applied to the upper receiver to install a Proof barrel, in my experience.

 

[RyanScott]

Perfect! Thank you.

 

[OUmookie]

Proof Research barrels are set up to run with JP bolts as their benchmark. I'd strongly suggest getting yourself a JP High Pressure Bolt along with appropriate firing pin from JP for your .260 Remington application.

I've built up multiple custom big block AR's with Proof CFW barrels and the JP High Pressure Bolts. Never one single hiccup.


View attachment 7243639View attachment 7243640View attachment 7243641

Those are great looking builds! What's the build sheet on the middle rifle?

 

[MSTN]

To answer your question:

A 7 pound even dry weight .308 built around a Proof Research 16" CFW barrel with intermediate length gas system, JP LMOS bolt carrier with high pressure bolt, SLR adjustable gas block, and V Seven titanium Furion brake. All housed inside the new Battle Arms Development billet 7.62 receiver set with matching 15" forend. LaRue MBT trigger, Vltor lower receiver extension, Heavy Buffers recoil spring, and normal H2 buffer round out the innards. All small parts in titanium from V Seven. MFT stock works amazingly well and weighs next to nothing. Great glass in the form of the Kahles K16i, riding in the bulletproof Spuhr SP-3026 mount. Recoil is amazingly light, plus accuracy is quite acceptable, especially considering the rifle's 7 pound weight.

 

[deersniper]

How about swapping a 6.5cm proof CF into a .308 Seekins SP10?

Do I need to buy a bolt or do anything ?


Do you guys lap the receiver or use loctite or anything? I had a decent smith put a WOA Douglas into a AERO mono upper and he just put a little loctite on the end of the barrel and tightened the nut by hand and that was it. Thought there was more to it for a accurate build?

 

[LongRangeAggie]

How about swapping a 6.5cm proof CF into a .308 Seekins SP10?

Do I need to buy a bolt or do anything ?


Do you guys lap the receiver or use loctite or anything? I had a decent smith put a WOA Douglas into a AERO mono upper and he just put a little loctite on the end of the barrel and tightened the nut by hand and that was it. Thought there was more to it for a accurate build?

I don't know about the Proof to Seekins. But you should be fine if the Seekins will take a DPMS barrel extension.

I have gathered that installing a quality barrel on a quality upper all you need to do install the barrel and use some moly grease on the barrel nut threads and torque it to 30-40 lb-ft.

BTW how the hell is that guy a gunsmith and installing AR barrels hand tight??

 

[deersniper]

I don't know about the Proof to Seekins. But you should be fine if the Seekins will take a DPMS barrel extension.

I have gathered that installing a quality barrel on a quality upper all you need to do install the barrel and use some moly grease on the barrel nut threads and torque it to 30-40 lb-ft.

BTW how the hell is that guy a gunsmith and installing AR barrels hand tight??

He runs a company that makes super accurate ARs and now bolt actions.

Idk. He just put a ratchet on it. Yanked on it and called it good

 

[D46Infinity]

I have installed a proof barrel into a Seekins platform upper with no issues. It is head spaced to a JP high pressure bolt and variable weight carrier. The gas block is a SLR adjustable. It’s a 6.5 creed and shoots very well.

 

[Bigjake83]

I have gathered that installing a quality barrel on a quality upper all you need to do install the barrel and use some moly grease on the barrel nut threads and torque it to 30-40 lb-ft.

That is an incredibly false assumption

 

[deersniper]

That is an incredibly false assumption

So the pro builder was wrong to not lap/face the upper and should have used more than just loc tite around the base of the barrel ?

 

[Bigjake83]

So the pro builder was wrong to not lap/face the upper and should have used more than just loc tite around the base of the barrel ?

No ...that he thinks just putting some grease on the threads and torquing it to 30 to 40 foot pounds is all it takes.

 

[Merle]

No ...that he thinks just putting some grease on the threads and torquing it to 30 to 40 foot pounds is all it takes.

Care to let us in on your trade secret? Is there more to it than that?

 

[Bigjake83]

Care to let us in on your trade secret? Is there more to it than that?

30 to 40 foot pounds is barely the minimum that I would do with an AR-15!! Usually 50-6o foot pounds is where you want to be when installing an AR-15 barrel and closer to 70 with a large frame AR.

Seating the barrel properly whether it requires heat or a bonding agent is a critical step along with seasoning the barrel nut and receiver threads.

 

[deersniper]

30 to 40 foot pounds is barely the minimum that I would do with an AR-15!! Usually 50-6o foot pounds is where you want to be when installing an AR-15 barrel and closer to 70 with a large frame AR.

Seating the barrel properly whether it requires heat or a bonding agent is a critical step along with seasoning the barrel nut and receiver threads.

Who do you recommend for barre installs?

 

[Bigjake83]

Who do you recommend for barre installs?

Where are you located?

If you're not comfortable with doing the install id ask the closest Smith to you who has a good reputation, I definitely wouldn't have the previous Smith do the work....lol