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POF Upper .308 Compatible Barrels?

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firestorm1284

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Jun 19, 2010
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#1
Hey Hiders, I ordered up a Gen III POF upper/lower/rail combo off of the group buy page. I've seen a couple posts now that state that the barrel nut is not compatible with standard barrel profiles, and that a barrel needs to be sent to a 'smith to make it work. However, I have yet to see a post that says exactly what doesn't fit, or a picture showing the problem.

Basically, I'm trying to find a barrel that WILL work without having to send it off. Either that, or have a custom barrel shop make the barrel with the correct profile from the get go. I had Black Hole Weaponry in mind, I'm not sure if they can do that or not.

Also, do all other parts fit the POF upper/lower the same as the DPMS, aside from the ambi bolt relese?
 
#2
Re: POF Upper .308 Compatible Barrels?

Edited to add: With the POF you will need an AR15 Lower Parts Kit, and not a AR10 .308 Lower Parts Kit....

I had called POF about the fitting of a barrel for this same kit. We were both on Brownell's looking at this: http://www.brownells.com/.aspx/sid=80466/pid=42629/Product/FA_TU_003_TM_SS_18_5__308_NM_SS_BBL The person at POF said that it looked as if it was compatible, so I ordered it. The barrel arrives at my house from Brownell's, and I start putting the rifle together.

Now for the problem. The interior of their barrel nut has a contour. That contour does not match the outside contour of the barrel, so the barrel nut will not slide up far enough to engage the threads on the upper receiver.

The point where the barrel begins to taper and where the barrel extension end is too long. It is about one full inch too long.

IMG00205-20110511-2202.jpg
 
#3
Re: POF Upper .308 Compatible Barrels?

Cut the barrel nut so that it is 1.5" long (from the threads forward).
The POF tapered section of the barrel nut starts at 1.60".
You will still have plenty of space ahead of the groove to get a barrel wrench mated to the nut.

The barrel nut is extra long so that it acts as a heat-sink.
Now it will act like a smaller, lighter, more tactical heat -sink.
 
#4
Re: POF Upper .308 Compatible Barrels?

I like that..... LOL
wink.gif


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hamilton</div><div class="ubbcode-body">Now it will act like a smaller, lighter, more tactical heat -sink. </div></div>
 
#6
Re: POF Upper .308 Compatible Barrels?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: redirt78</div><div class="ubbcode-body">You should call Rock and talk to someone since they make the POF barrels, unless POF modifies them they should be able to fix you up.
</div></div>

Not this.

POF buys straight blanks and has them contoured.
 
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#7
Re: POF Upper .308 Compatible Barrels?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: firestorm1284</div><div class="ubbcode-body">Hey Hiders, I ordered up a Gen III POF upper/lower/rail combo off of the group buy page. </div></div>

And by the way, that's not a POF-USA group buy or even an authorized third party reselling, so for others considering it do not expect full POF support.
 
#9
Re: POF Upper .308 Compatible Barrels?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: firestorm1284</div><div class="ubbcode-body">Thanks for the responses guys. Is the consensus here to modify the barrel nut, or modify the barrel? </div></div>

Unless you have access to a machine shop, I would not chop off to muzzle end of the barrel nut. Bad thing about ordering a barrel is that it can take time, and may have some unexpected cost.....

I guess it boil down to how long you want to wait and how much cash you have on hand....

JM2C:

Hugo
 
#10
Re: POF Upper .308 Compatible Barrels?

Well I do have a 12x36 lathe, and a Bridgeport in my garage. So I could likely make the modifications to the barrel nut, I probably wouldn't want to start messing with the barrel however...
 
#11
Re: POF Upper .308 Compatible Barrels?

Cutting a pipe in half could be difficult.
This really isn't one of the difficult ones.
Gain access to:
A band saw, (or a hack-saw) with the proper blade, and a few minutes of filing/de-burring and a little clean-up is all it will take.

Do you really want a giant heat sink anyway?
I didn't so I fixed mine.

The POF railed handgaurd you recieved is pretty nice too but it adds 0.400" of height to your optic.
I dislike anything but a descent cheek-weld so I also cut out a rail section to clear a 40mm mk4's (w/lens caps) objective lens.
Mill away 0.250" off the top rail, and you're still left with 0.150" of material underneath (plenty).

The scope now sits very close to the rifle and my cheek-weld is excellent without any need for cheek risers.
 
#12
Re: POF Upper .308 Compatible Barrels?

Hamilton - Thanks for the response.

So modifying the barrel nut isn't something that would work "in theory", you have actually done this, correct? Cutting the barrel nut would be no problem for me, I just want to make sure that will work before I order the barrel. If you did this, do you see any lack of strength due to that modification?

Thanks for the tip on the rail height. I, too thought of that, but I will be using a PRS stock, so that should take care of that problem.
 
#15
Re: POF Upper .308 Compatible Barrels?

I would love to, That was my original intent, 300-400 on the barrel, but this seems to be the best way to go. If I can find something that fits in that price range I will be sure to get it. I am hoping that someone else can weigh in on this. Also I am waiting to hear back from POF. to see if they are willing to sell us their barrels.
 
#16
Re: POF Upper .308 Compatible Barrels?

I got an email back from rainier arms saying that their 308 dpms pattern barrels will fit the POF barrel nut. just a heads up, they have some barrels for 250-400 depending on style.
 
#17
Re: POF Upper .308 Compatible Barrels?

I would email them back for measurements of their profile, and compare it to the barrel nut before ordering or send them the barrel nut for them to compare.

Measure twice.... Cut once....
wink.gif


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tomahawk84</div><div class="ubbcode-body">I got an email back from rainier arms saying that their 308 dpms pattern barrels will fit the POF barrel nut. just a heads up, they have some barrels for 250-400 depending on style.

</div></div>
 
#18
Re: POF Upper .308 Compatible Barrels?

I took my set to a gunsmith..I am just having the front section of the barrel nut bored to match the diameter of the barrel...

Its alum... its just a matter of opening up an 1.5 section and it will still act as the intended heat sink while supporting both ends of the chamber area....

I would also appreciate input....

I will share when I get it together...thanks
 
#20
Re: POF Upper .308 Compatible Barrels?

I got my POF upper/lower/rail today. it is pretty sweet! Now to decide on a barrel. I do like the look of those Rainier ultramatch barrels. These will work without any modifications with the POF barrel nut?
 
#22
Re: POF Upper .308 Compatible Barrels?

Went and visited mine today..

smith bored front of nut out to mate with dpms MK 12 barrel nice tight fit ...looks like both ends of the chamber will be supported...

suggestion take measurement inside front of barrel nut then get measurement from companies on biggest part of barrel.. should be able to get a barrel that way or just get dthe barrel you want and have a machinist open it up that first 1.5 "


Good Luck .. I am hoping mine will be a shooter
 
#23
Re: POF Upper .308 Compatible Barrels?

Here is what I found out about the POF barrel nut. It will fit the standard profile DPMS .308 barrels except the SASS barrel. The SASS barrel is made extra thick at the chamber. But any standard DPMS should fit. As for the SASS barrel, it needs the POF barrel nut opened up a bit.
 
#24
Re: POF Upper .308 Compatible Barrels?

What thread pattern do the POF uppers use? Is it DPMS/SR-25 or proprietary? Kind of related, kind of random, but hey whatever
 
#26
Re: POF Upper .308 Compatible Barrels?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: hugo121175</div><div class="ubbcode-body">I just put mine together last night.... Hart spun down the contour of my barrel to match the contour of the inside of POF's barrel nut....
</div></div>Nice, let us know how it does
 
#29
Re: POF Upper .308 Compatible Barrels?

the setup came out nice.....got a few of these back up in the group buy thread.....if you know the barrel diameter in advance, I can get the nut modified for you.

I have edited this post two times trying to decide if I should comment on Soberbiker's statement or not......but if you purchased any of these from the group buy and need help.....the original manufacturer will stand behind them.
 
#31
Re: POF Upper .308 Compatible Barrels?

I was about the get the Rainier when I came across a used POF barrel that was switched out for a 6.5 barrel. There will be no piston parts with it, so I am going to run it as a DI setup. Once I get my barrel in hand I will order up a Paladin adjustable gas block.
 
#32
Re: POF Upper .308 Compatible Barrels?

I had problems with my set-up over the week-end. I was way over gassed and ripping the rims off my cases. I took the whole match to get the JP gas block adjusted so the weapon would function 100%. Just a heads up if you plan one not getting a adjustable gas block before hand....
 
#33
Re: POF Upper .308 Compatible Barrels?

I got the PRI gas block, and plan on running some rounds through it to get it where i want it, Thanks for the heads up I should have pics up in a week or two, parts will be in at the end of the week, and then a few days to build it and shoot it.

Hopefully the barrel nut fits the rainier arms barrel... I will know in a few days.
 
#35
Re: POF Upper .308 Compatible Barrels?

Rainier arms barrels do not fit the nut. I cut the barrel nut down to fit over the barrel it seems to be working just fine.

all i have left to do is get the gas block installed. the gas tube i tried was imposible to fit in the PRI adj. gas block. I will be installing and test firing the gas block this week and will get the pics up soon.
 
#36
Re: POF Upper .308 Compatible Barrels?

I had a feeling that their barrels wouldn't fit..... The barrel nut has a unique interior profile. Hart cut my barrel down to fit the nut exactly, so he may still have the measurements if anyone else needs a barrel made to fit......
 
#38
Re: POF Upper .308 Compatible Barrels?

I just made everything hand tight, I'm going to install the gas block another day and then shoot it over the weekend. I will see how it does from a bench at 50 yards then move out to 100 after i get the irons zeroed, and on paper then will do a 100 yard zero for the irons. Im excited to see how it does. I built this for just under 1200.00 total and am pleased with it so far hopefully it shoots and cycles.
 
#41
Re: POF Upper .308 Compatible Barrels?

here is a pic at the range, I have some good groups, 3 or so inches at 100 without any bags or support, just resting the mag on the bench. I only had soft point ammo, i know it's not the best for Semi auto but its all i could get. 60 rounds went through with no trouble. recoil was manageable, and follow up shots were quick at 50 yards.



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