Building my JD machine Tech .308

[415shooter]

Hey All,

I'm slowly building my JD Machine Tech 308, and I need some advice.  I want to run a Vltor stock(easiest cheekweld for me) but I'm concerned that if I use a 18" barrel that I won't be able too.  All of the 18" barrels I'm looking at are mid-length.  Will that be a problem?

[edgecrusher]

Hey All,

I'm slowly building my JD Machine Tech 308, and I need some advice.  I want to run a Vltor stock(easiest cheekweld for me) but I'm concerned that if I use a 18" barrel that I won't be able too.  All of the 18" barrels I'm looking at are mid-length.  Will that be a problem?

Not quite sure why the gas port length will have anything to do with stock cheek weld, could you explain your concern more please?

[415shooter]

I've been told that I always need to match the gas length and the buffer length is why I'm concerned.

[edgecrusher]

Who ever told you that is full of it, for real.  :cookoo: It seems you want to go with a carbine style set up, with the Vltor stock, you just need to get the right components for that.

Here you go, Clint is a great guy with the best! buffers!

http://heavybuffers.com/ar10carbine.html

I believe he has tubes and springs too, one stop shop. I run his buffers in all my rifles, flawless function, great recoil reduction.

[ipsick]

I run a carbine buffer tube on my AR-15 lower with a rifle length gas 18" barrel.

On my LR-308, I run a rifle buffer tube with a mid length gas 18" barrel.

It's ok to mix and match these items.

[Rsquared]

Who ever told you that is full of it, for real.  :cookoo: It seems you want to go with a carbine style set up, with the Vltor stock, you just need to get the right components for that.

Here you go, Clint is a great guy with the best! buffers!

http://heavybuffers.com/ar10carbine.html

I believe he has tubes and springs too, one stop shop. I run his buffers in all my rifles, flawless function, great recoil reduction.

+1 on his buffers. I wouldn't use anything else.

[415shooter]

So I'm trying to find a handguard that will work with my JD upper.  I know that DPMS has 2 heights.  Does anyone know which 1 JD is?  I'm looking at a Black Rain Ordinance handguard.  I'm willing to go with others, I just don't want to have a beast that I can't shoot without a bench.

[edgecrusher]

You most likely do NOT have the high rise height, so almost all of the rails you look at will be ok.

[415shooter]

You most likely do NOT have the high rise height, so almost all of the rails you look at will be ok.

Thank you Edge,  You are very quick on the responses, which I appreciate.

[edgecrusher]

Thank you Edge,  You are very quick on the responses, which I appreciate.

I am on twin time my good man, I am up on the East coast feeding and burping the next generation of shooters and spotters out here!

[415shooter]

Congratulations!  I'm a couple years away from that still, at least thats what the GF and I say.  I will definately pick your brain.  I haven't shot my 15 past 50 yards, and I want to shoot out a ways, but employment would help with that first.

[edgecrusher]

I love shooting out at distance, and then turning around and running a cqc course! 

[98Z5V]

I've been told that I always need to match the gas length and the buffer length is why I'm concerned.

I'm a little late to this game, but just for reinforcement...  THAT is bullpoopy....  Complete bullpoopy.

 

That's not necesarily for you, OP, at this point, but it's more for anyone else that searches out this thread, looking for an answer.

 

That's COMPLETE bullpoopy.

[will92104]

You most likely do NOT have the high rise height, so almost all of the rails you look at will be ok.

JD Machine uses the older high profile on their 308 uppers. You can tell by measuring the tab that hangs over the charging handle. 1/8th is the newer DPMS low profile. 3/16ths is the older DPMS higher profile , which is what JD uses. it is confusing trying to find a hand rail that will fit. Centurion, Troy, Rainier arms,& Daniel Defense are some that still have those that will match the JD upper. If there are more feel free to list them. DO NOT CONFUSE THE HIGHER PROFILE WITH DPMS LR308 AND SPORTICAL HIGH PROFILE. These upper receivers are way higher than the older high profile and will not match any hand guard unless you buy it directly from DPMS....i did and now i have an expensive paperweight until i can find someone that needs one.http://www.dpmsinc.com/308-WIN-762-NATO-16-18_ep_190-1.html