JUGGERNAUT JT-15 SSP Semi conversion

[RustVendor]

Ive never had reliability issues at all. I shoot 1000's of rounds.
Biggest issue is gas to the face (im left handed) so i use gas diverting bcgs and and charging handles. And adjustable gas blocks.
What kind of issues did you get with a shorter barrel, maybe its something else?

IF someone is adept at tuning they can tune a short barrel with adjustable gas blocks/buffer weights etc. IF someone is a complete beginner they are going to have a bad time. And you are also describing the other issues that had to be mitigated with extra parts. An 11.5 inch barrel will just work better. It just does.

 

[RustVendor]

Reliability in what way?

Theres an interplay between dwell time which is a function of gas tube length and barrel length, and gas volume. A short barrel needs all of the gas required to cycle the bolt to come though in a tiny window. A 7.5" is this to the extreme, all the gas has to come though all at once so there is a much small window for it to run well and it inherently more violent. It may just work, but it may not, but a super short barrel with pistol gas length is inherently harder to get right and has zero advantage whether that's ballistically or just the experience of shooting it. It's 100% fashion over function

 

[Jeffro_510]

My favorite was actually my 12" LMT
But i sold it to make poor financial decisions into a different gun, lol.
I kept my 10.5 Aero, no issues with it at all.
Wifes 7.5 has never had an issue, its louder though, lol.
Ive had fun shooting all of them without issue.
I think because the internet said so, isnt a fair example of reliability. Too many variables. I mean i get it, you arent making a 1000 yard shot with a 7.5. 99% of the people on here will never shoot past 100 yards anyways.
Ive only shot my handgun out to 100 yards. My ARs have never been past 50, but did so reliably, lol

 

[RustVendor]

My favorite was actually my 12" LMT
But i sold it to make poor financial decisions into a different gun, lol.
I kept my 10.5 Aero, no issues with it at all.
Wifes 7.5 has never had an issue, its louder though, lol.
Ive had fun shooting all of them without issue.
I think because the internet said so, isnt a fair example of reliability. Too many variables. I mean i get it, you arent making a 1000 yard shot with a 7.5. 99% of the people on here will never shoot past 100 yards anyways.
Ive only shot my handgun out to 100 yards. My ARs have never been past 50, but did so reliably, lol

It's not "the internet" it's physics, a narrower operating window means it's less reliable. You already described that you have a ton of extra things you had to do to tune it and make it not blast you in the face. the dwell time on a 7.5" barrel is extremely short and violent, it doesn't work as well as a longer barrel. Yours may work fine, another person who has never tuned an AR and just wants it to work may have a bad time. Again, there's zero benefit to having a tiny barrel, it's literally just to look at and has more potential issues and more parts wear.

 

[PAGANSAINT71]

People always say that. I dont get why.
I have a 10.5, but have built and shot a 7.5, a 5.5, and a 12.5.
They were all fun to shoot.

Anything in 556 shorter than 10 5" will not function correctly. Without tuning there isn't enough dwell time and could be prone to not cycling correctly.In addition all the gasses will not burn in the barrel. It will literally be blowing fire

 

[jay-elz]

Anything in 556 shorter than 10 5" will not function correctly. Without tuning there isn't enough dwell time and could be prone to not cycling correctly.In addition all the gasses will not burn in the barrel. It will literally be blowing fire

So why does juggernaut offer a almost complete upper to run it semi automatic? This would be in the same barrel size.

 

[AR15barrels]

What does the upper have? Have you taken it apart yet? Take the handguard off and see if there's a gas port, if there isn't you need a barrel and a gas block and tube

There's no gas port on the JT15's.
Not only is there no gas port, there's no gas block seat on the barrel that you can install a gas block.
I believe that JT does this on purpose so you can't convert the existing parts as easily.
Then they offer a new upper without a bolt carrier and charging handle as the way to "convert" the gun.

The less expensive solution is a new barrel, gas block and gas tube.
The JT barrel could be recontoured to a 0.625" barrel with a gas block seat, but the cost of that exceeds the cost of a replacement barrel.
The rest of the upper parts will work just fine with a new barrel, gas block and gas tube.

I have done several of these for other people and that is the way I would do it for myself if I was gifted a JT15 pistol.

 

[PAGANSAINT71]

So why does juggernaut offer a almost complete upper to run it semi automatic? This would be in the same barrel size.

Buy it then, and after come back and post whether you are happy with it. If you want to run a short barrel like that I would go with a 300 Blk Out barrel and run heavy subsonic ammo. It's perfectly suited for home protection.

 

[RustVendor]

Also keep in mind that the experience of shooting it without the gas system is not the same experience because it's not cycling the bolt. A lot of the noise and gas and the bulk of the recoil impulse come from the action cycling not the round itself firing.

 

[jay-elz]

There's no gas port on the JT15's.
Not only is there no gas port, there's no gas block seat on the barrel that you can install a gas block.
I believe that JT does this on purpose so you can't convert the existing parts as easily.
Then they offer a new upper without a bolt carrier and charging handle as the way to "convert" the gun.

The less expensive solution is a new barrel, gas block and gas tube.
The JT barrel could be recontoured to a 0.625" barrel with a gas block seat, but the cost of that exceeds the cost of a replacement barrel.
The rest of the upper parts will work just fine with a new barrel, gas block and gas tube.

I have done several of these for other people and that is the way I would do it for myself if I was gifted a JT15 pistol.

Any recommendations on the DIY portion of it? The almost complete upper from JT is $450

 

[ricardosalazar]

Any recommendations on the DIY portion of it? The almost complete upper from JT is $450

Honestly I ended up paying the 450 since it’s matching upper and lowers just to not deal with the hassle of sourcing parts or gunsmith to work on it .

 

[jay-elz]

Honestly I ended up paying the 450 since it’s matching upper and lowers just to not deal with the hassle of sourcing parts or gunsmith to work on it .

Ahhhhh got it! Just got off the phone with JT and he said your only saving maybe a $100 depending on what your gunsmith charges.

 

[pancakes]

JUST DONT DO IT

 

[RustVendor]

Ahhhhh got it! Just got off the phone with JT and he said your only saving maybe a $100 depending on what your gunsmith charges.

Yeah of course they would say that but that's nonsense, you don't need a gunsmith to change a barrel. This is all you need, plus a wrench for the barrel nut but I don't know what the JT handguard uses:

Ballistic Advantage Barrel AR-15 Pistol 5.56x45mm NATO M4 Contour 1 7

This Ballistic Advantage Barrel is machined from CrMoV steel with a chrome lined bore and chamber with a manganese phosphate finish and phosphate coated...

www.midwayusa.com

Faxon Carbine Pistol Gas Tube AR-15

This Faxon Gas Tube is manufactured from tough stainless steel. These gas tubes can take anything you throw at them, including full-auto...

www.midwayusa.com

Aero Precision Low Profile Gas Block AR-15, LR-308 0.750 Nitride

These Aero Precision Low Profile gas blocks along with Aero Precision's gas tubes (sold separately) create an efficient and reliable gas system for your...

www.midwayusa.com

Presma AR-15 .223 Barrel Vise Block Rod w/ Torque Block for .750 Barrels Up to 17% Off, Blazin' Deal — 5 models

Shop Presma AR-15 .223 Barrel Vise Block Rod w/ Torque Block for .750 Barrels | Up to 17% Off Highly Rated on 36 Reviews for Presma AR-15 .223 Barrel Vise Block Rod w/...

www.opticsplanet.com

 

[jay-elz]

Solid! Appreciate the recommendations i’ll def look into it my man

 

[RustVendor]

just watch a bunch of videos on putting the gas block together and how it goes on the barrel, the most common mistake is alignment, it's not obvious because there will actually be a gap in between the gas block and the shoulder on the barrel.

 

[jay-elz]

just watch a bunch of videos on putting the gas block together and how it goes on the barrel, the most common mistake is alignment, it's not obvious because there will actually be a gap in between the gas block and the shoulder on the barrel.

Do you have links on it?

 

[RustVendor]

Do you have links on it?

I found this video, he actually says you don't need a gap LOL. but he shows how to pin the tube and stuff. Technically the gas block hole is oversized so there's wiggle room. I find it helpful to blow into the barrel after you install the block, you have to stick something into the chamber to stop air from going through but there should be air flowing freely through the tube and it will be obvious if it's lined up. That can save you a wasted trip to the range if it's not lined up.

 

[Plenty_Pack_556]

Less than 5 FFLs ( that I know of ) has the balls and knowledge to dros a ppt sse as semi.

(Only 1 AR pistol in marketplace priced as fair. )

 

[AR15barrels]

Any recommendations on the DIY portion of it? The almost complete upper from JT is $450

It's an AR-15 pattern gun.
Buy any barrel you want the the correct length gas tube and the correct diameter for the barrel.
If you don't have the ability to tear down and reassemble an upper, people like me will do that work for you.
I charge $70 to tear down and reassemble an AR upper.