What on earth are the threads on my Remington 700?

[Jamoy1993]

Edit: Not sure if this is in the right section or not?

Hi folks, so i got my ASE Utra Jet Z in 5/8x24 UNEF threads. I did research and i was under the impression that my Remington 700 barrel should be 5/8x24. The idea is to swap this moderator between my 300 blackout and my Remington 700 SPS Police from circa 2006. Bare in mind i bought this moderator for my 300 blackout barrel which i 100% know is 5/8x24, i just don't have it yet so cant test it out. So its not 100% a total loss. I am just trying to figure out if the moderator is in fact 5/8x24 so i don't get surprised in a month or two time when i do get my 300 blackout and it does not fit. I will be trying it on a friends rifle tonight to confirm this but this is a different matter entirely:

So it appears that in Remington great wisdom, this particular model does not have 5/8x24 threads on it... I have measured them and the nominal diameter comes out as 17mm. The only threads i can think of that match this is M17?

There does not appear to be any barrels made for Remington in these thread pitches. It is 100% the original barrel as its marked Remington. It does not look like custom work (if it is, its very good)

I am wondering if anyone can confirm what threads are on this? I noticed the thread cap differs from the standard short thread cap I see on most normal Remington rifles.

 

[Eric the Red]

The thread pitch is too coarse to be 5/8UNEF and it's over a mm larger. Given that's a spigot cut (most commonly seen on Blaser), it's certainly aftermarket - but therefore also could well be 17x1. Not a common thread these days. Even Blaser have dropped spigot - you may struggle to find a mod - almost certainly custom order. All things considered, I'd be talking to a gunsmith about a rethread. (Sorry)

 

[Jamoy1993]

The thread pitch is too coarse to be 5/8UNEF and it's over a mm larger. Given that's a spigot cut (most commonly seen on Blaser), it's certainly aftermarket - but therefore also could well be 17x1. Not a common thread these days. Even Blaser have dropped spigot - you may struggle to find a mod - almost certainly custom order. All things considered, I'd be talking to a gunsmith about a rethread. (Sorry)

I have just discovered this myself. It looks like it will be a re-thread job (ffs) Its a Remington 700 LTR TWS and was never offered threaded.

I think there's enough meat to turn down and re-thread. If not I would not mind having the threads lopped off and it done on the meat behind it as it would only lose me about 1 cm of barrel.

Thanks.

 

[Cyres]

Did you buy it new or SH? Technically if it has been re threaded it should have been re proofed prior to re sale.
D

 

[Tim1]

It looks a bit rough but I would keep the spigot and buy another moderator. A spigotted thread is far superior to an unspigotted one.

T

 

[Liveonce]

going by the photo which obviously is best guess it looks like 8 threads over 12mm which would
make it a M17 x 1.5mm. look for a cheap nut to buy to check it.

 

[Tim.243]

I have just discovered this myself. It looks like it will be a re-thread job (ffs) Its a Remington 700 LTR TWS and was never offered threaded.

I think there's enough meat to turn down and re-thread. If not I would not mind having the threads lopped off and it done on the meat behind it as it would only lose me about 1 cm of barrel.

Thanks.

Looking at the charts you might squeeze 5/8unef m14 no problem 1/2unf
or cut it back and start to what you want
good luck

 

[Jamoy1993]

going by the photo which obviously is best guess it looks like 8 threads over 12mm which would
make it a M17 x 1.5mm. look for a cheap nut to buy to check it.

Thats what ive done, should tell me for sure

 

[Jamoy1993]

Did you buy it new or SH? Technically if it has been re threaded it should have been re proofed prior to re sale.
D

It was second hand. No idea if it was re-proofed or not but it has proof marks.

 

[TringSaint]

I believe mine is 5/8UNEF

 

[Jamoy1993]

I believe mine is 5/8UNEF

I've confirmed this rifle isnt threaded from factory, I will get a thread converter and eventually will get 5/8x24 threaded onto it. Might even consider a rebarreling.

 

[TringSaint]

I've confirmed this rifle isnt threaded from factory, I will get a thread converter and eventually will get 5/8x24 threaded onto it. Might even consider a rebarreling.

Mine was recut when the barrel was shortened but I checked the emails and that was the thread of the dpt mod I bought.

 

[Cyres]

If it's been reproofed the proof marks will be stamped on muzzle end of the barrel.
D

 

[BE Precision]

i think you'll struggle to get a thread convertor from that thread, whatever it is to 5/8x24, and even if you do i would be wary of stacking of tolerances and generating excessive runout between the bore and moderator exit hole, especially with a forward mounting moderator like a jet-z. i fitted one (a Jet-z) the other day, and when fitted to a perfectly cut concentric thread there was in excess of 0.010" TIR runout at the exit hole, that's 0.005" each side of the centreline of the bore. that's fine, but not as good as i would have hoped for. Considering the exit hole is 0.040" over bore size (0.020 each side) so 0.015 clearance on the one i fitted. fitting an interface piece, of unknown quality, on a thread of unknown quality could have issues. i'd pay the money, have it cut properly by someone who knows what they are doing. a baffle strike at best ruins your expensive moderator, at worst.......!!

 

[TringSaint]

i think you'll struggle to get a thread convertor from that thread, whatever it is to 5/8x24, and even if you do i would be wary of stacking of tolerances and generating excessive runout between the bore and moderator exit hole, especially with a forward mounting moderator like a jet-z. i fitted one (a Jet-z) the other day, and when fitted to a perfectly cut concentric thread there was in excess of 0.010" TIR runout at the exit hole, that's 0.005" each side of the centreline of the bore. that's fine, but not as good as i would have hoped for. Considering the exit hole is 0.040" over bore size (0.020 each side) so 0.015 clearance on the one i fitted. fitting an interface piece, of unknown quality, on a thread of unknown quality could have issues. i'd pay the money, have it cut properly by someone who knows what they are doing. a baffle strike at best ruins your expensive moderator, at worst.......!!

If I was unsure I would chop the threaded part off and have it redone to a known thread and get the crown done at the same time. Shouldn’t cost too much and as BEP says above, it’s a lot cheaper than buggering up your shiny new mod!!

 

[Jamoy1993]

If I was unsure I would chop the threaded part off and have it redone to a known thread and get the crown done at the same time. Shouldn’t cost too much and as BEP says above, it’s a lot cheaper than buggering up your shiny new mod!!

Aye I'm going to see how much it would cost. I know a few local smithy's. Thanks guys.

 

[TringSaint]

Aye I'm going to see how much it would cost. I know a few local smithy's. Thanks guys.

When I had mine done in 2021 it cost £80 to have the barrel shortened, threaded and recrowned by JR Firearms who are near to me.
Hope that helps.

 

[Smellydog]

Count the tpi

 

[Ronin]

Looks 17x1mm spigotted

 

[dasherman]

Just have someone chop it back leaving enough of the (poorly turned) spigot to have a 5/8x24UNEF thread put on. Then you can use your existing Jet Z mod. Loosing less than an inch will make no difference to it if it’s a .308.