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.936 Adjustable Gas Block and Extended Length handguard?


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#1 Justintoxicated

 
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Posted 12 February 2013 - 08:00 AM

So I'm looking for .936 adjustable gasblock, but I also want an extended length handguard / float tube.  Are there any combos where I can put the gasblock under the handguard and still have access to adjust it?  I was thinking to go with the JP Modual handguard and JP low profile adjustable gas block but I don't know how well this will work out.  JP said it would work, but the email was really brief and I'm having my doubts.

This is the barrel I will be using and I'm not sure if it is dimpled for the gas block. (Hoping it is a good one, it does not say that it is rifle cut or hand lapped, so I'm hoping I'm not making a mistake).  I had ordered a custom barrel but I will probably cancel that for now.
http://www.rainierar...product_id=2233


#2 98Z5V

 
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Posted 12 February 2013 - 08:21 AM

Considering the handguard and gas block you're looking at - they're both made by the same manufacturer, and that manufacturer says they'll work together.  I think I'd trust the manufacturer of those parts, about their compatibility.  <dontknow>

If they don't work together, you've always got this going for you - there's only one place to contact about the problem.  <thumbsup> ;D

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#3 Justintoxicated

 
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Posted 12 February 2013 - 05:20 PM

is the JP classic FF tube any good or is it a pain to install?  I got their new rapid configuration one and it has a nice barrel nut system on it, but the classic modular one seems like it might be more difficult?  Of course they don't make the rapid config one for LR308. I read something about having to loctite the barrel nut and wait for it to dry as part of the install process.  Which has me a little worried about someday having to remove it to change barrels.

#4 racerken70

 
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Posted 12 February 2013 - 06:28 PM

the barrel nut threads into another piece that gets locktighted to the receiver threads. so changing a barrel will be no prob. if the other piece ever needs too come off the receiver a heat gun and a few minutes would be all it takes. i can adjust my gas block through the slots in the hand guard. as for the gas block i think all jps are clamp on, so you dont have to dimple the barrel

#5 Justintoxicated

 
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Posted 12 February 2013 - 06:49 PM

the barrel nut threads into another piece that gets locktighted to the receiver threads. so changing a barrel will be no prob. if the other piece ever needs too come off the receiver a heat gun and a few minutes would be all it takes. i can adjust my gas block through the slots in the hand guard. as for the gas block i think all jps are clamp on, so you dont have to dimple the barrel


So you used red lock-tight and could still remove it?  You didn't have any problems with the outer piece slipping? 

Is there by chance a similar tube that has a better barrel nut assembly? 

It seems kinda complicated, or harder to adjust, compared to their new tubes.

#6 racerken70

 
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Posted 12 February 2013 - 07:03 PM

the outer piece gets the red locktite the inn barrell nut gets anti siezeed the only reason you would have to remove the outer piece is if you were changing to a different hand guard. the reason for the locktite is to keep the outer piece in position for torqueing the barrel nut. after that the torque is what would keep it all in place. you locktite the outer barrel nut to the receiver and let it set up over night. then install the barrel and tighten the inner nut. takes no time at all.

#7 edgecrusher

 
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Posted 12 February 2013 - 08:28 PM

I'm going to step in here and say that I personally feel red loctite might be a mistake. I personally would use blue.
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#8 Justintoxicated

 
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Posted 12 February 2013 - 10:17 PM

the outer piece gets the red locktite the inn barrell nut gets anti siezeed the only reason you would have to remove the outer piece is if you were changing to a different hand guard. the reason for the locktite is to keep the outer piece in position for torqueing the barrel nut. after that the torque is what would keep it all in place. you locktite the outer barrel nut to the receiver and let it set up over night. then install the barrel and tighten the inner nut. takes no time at all.


So the only thing that prevents the outer piece from turning while you potentially torque the piss out of the barrel nut is the lock-tight?  Seems like a screwy design to me.

I'm quickly finding out that all other 15" free float tubes I find are only clamp on style, which does not seem like a great design to me at all for a tube that is 15" long, and/or I would still have the issue of being able to reach the adjustable gas block without removing the handguard.

What do you guys think about the JD handguard in comparison?
http://www.jdmachine...uct_Code=223CHG
And the barrel nut:
http://www.calguns.n...ad.php?t=435301

I would probably have to drill a hole in the tube to access the adjustable gas block though. 

I can't find a forward facing adjustment screw gas block in .936 :(

#9 racerken70

 
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Posted 12 February 2013 - 11:10 PM

the jp is exactly the same setup as the jd machine they just recomend using the locktight vs a piece of gas tube, but the inner and outer nut setup is the same.

#10 Justintoxicated

 
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Posted 12 February 2013 - 11:33 PM

the jp is exactly the same setup as the jd machine they just recomend using the locktight vs a piece of gas tube, but the inner and outer nut setup is the same.


The gas tube tool isn't to hold the outer nut in place, it is to line up the gas tube.  I usually just use a drill bit that is the same diameter.

#11 Rsquared

 
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Posted 12 February 2013 - 11:38 PM


I would probably have to drill a hole in the tube to access the adjustable gas block though. 


No big deal. I did that for a Troy TRX rail that I have on one of my AR-10's with a PRI lo-pro adjustable blocks. With a little touch-up....no one will ever even notice it at a glance.

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#12 Justintoxicated

 
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Posted 13 February 2013 - 07:19 PM

Anyone make a low profile .936 adjustable gas block in steel or SS?  I can't seem to find anyone making them....

#13 98Z5V

 
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Posted 13 February 2013 - 08:16 PM

PRI.

Precision Reflex.

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#14 Justintoxicated

 
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Posted 13 February 2013 - 09:11 PM

PRI.

Precision Reflex.


This one?
http://www.precision...186815&CAT=4274

Will it fit under the Apex handguard?  I'm guessing not since that would be nice :(

I'm leaning towards the Apex handguard now, I don't like that it is "clamp on style" but it seems better than relying on a bunch of lock-tight.  Not sure which Rail height I would need since I'm not attaching to a DPMS Receiver.  It will be going on a JD Machine receiver if anyone knows how that compares.

I didn't think picking a handguard and gas block would be so difficult.  Definitely very limited compared to the stuff out there for AR-15's.

#15 EasyEJL

 
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Posted 13 February 2013 - 09:19 PM

well, if you go with a non-floating handguard, theres no issue, but the gas block will be visible
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#16 Rsquared

 
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Posted 13 February 2013 - 09:37 PM

This one?
http://www.precision...186815&CAT=4274

Will it fit under the Apex handguard?  I'm guessing not since that would be nice :(


It should fit.

Not sure which Rail height I would need since I'm not attaching to a DPMS Receiver.  It will be going on a JD Machine receiver if anyone knows how that compares.


I think that JD is still gonna be the SR25/DPMS pattern.

I'm still watching you mister.............


#17 Justintoxicated

 
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Posted 13 February 2013 - 11:00 PM

It should fit.

I think that JD is still gonna be the SR25/DPMS pattern.


Forgive my ignorance but does that mean pre or post 2009?
http://www.apexhandg...Y&per=12&num=24


#18 98Z5V

 
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Posted 13 February 2013 - 11:22 PM

You'll have to do one of two things - measure it, or call JD and ask them.

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#19 Justintoxicated

 
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Posted 14 February 2013 - 12:04 AM

You'll have to do one of two things - measure it, or call JD and ask them.


lol @ call JD, they haven't been taking phone calls in months.
not sure how to measure it otherwise since it wants to measure from the center of barrel... Oh well not like I can get this handguard or gas blocks right now anyways....

#20 98Z5V

 
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Posted 14 February 2013 - 12:14 AM

lol @ call JD, they haven't been taking phone calls in months.


Sure, they take calls.  Talked to them a week and a half ago, about the timeline between ordering and shipping for the 308 matched upper/lower.  Their answer was:  Every order placed right now will be ready to ship somewhere between 3 and 4 months.

They'll answer, you just need to be persistant.  I got through the first try.

There's a thread pinned in the DPMS section that tells you how/what to measure. 

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