cworks Posted January 27, 2014 Share Posted January 27, 2014 I am looking for a Carbon Fiber hand guard that is vented and has a large enough ID to fit my JP thermal Dissipator. Also, is there a CF hand guard that work with the JP barrel nut? Any measurements or suggestions are welcome. Link to comment Share on other sites More sharing options...
kampr Posted January 27, 2014 Share Posted January 27, 2014 (edited) I have a early Carbon Arms 15" that fits a JP barrel nut, it's not vented though. I.D. is 1.875" Edited January 27, 2014 by kampr Link to comment Share on other sites More sharing options...
cworks Posted January 27, 2014 Author Share Posted January 27, 2014 Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" Link to comment Share on other sites More sharing options...
michael1778 Posted January 27, 2014 Share Posted January 27, 2014 You darn well better have some special things to cut carbon fiber (more process than tools, from what I gather). The debris can cause lung damage from what I understand. My experience with CF is as a structural designer for submarines and aerospace structures. I only made my own plates a couple of times. I'd personally *never* cut CF myself. Others will surely chime in soon with their experiences. Link to comment Share on other sites More sharing options...
The Donald Posted January 27, 2014 Share Posted January 27, 2014 When cutting stuff like carbon fiber keep it wet and it keeps most of it contained. Good idea to wear a mask but nothing really fancy. I used to machine a lot of really nasty materials (beryllium/low grade uranium) you don't want to breath. Machined pretty much everything in a flood of coolant. We wore some pretty exotic masks and had an air flow coming from behind us. Link to comment Share on other sites More sharing options...
bagdrag Posted January 27, 2014 Share Posted January 27, 2014 Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" FYI, the Lancer will fit the JP Thermal Dissipator. I have one on mine right now. Not sure about the Carbon Arms guard. If I were to use the Carbon Arms guard, I probably wouldn't even try to vent it. I wouldn't want to compromise the carbon fiber. I can only hope/guess that when Lancer vents theirs, they don't compromise the carbon fiber. The only reason not to go with the Lancer is if you think it will feel too fat in the hand. Mine feels a little fat when compared to my JP modular handguard, but I have gotten used to it. Link to comment Share on other sites More sharing options...
cworks Posted January 27, 2014 Author Share Posted January 27, 2014 (edited) Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" FYI, the Lancer will fit the JP Thermal Dissipator. I have one on mine right now. Not sure about the Carbon Arms guard. If I were to use the Carbon Arms guard, I probably wouldn't even try to vent it. I wouldn't want to compromise the carbon fiber. I can only hope/guess that when Lancer vents theirs, they don't compromise the carbon fiber. The only reason not to go with the Lancer is if you think it will feel too fat in the hand. Mine feels a little fat when compared to my JP modular handguard, but I have gotten used to it. Is the weight reduction that noticeable?? is it solid? did you use the lancer barrel nut? Edited January 27, 2014 by cworks Link to comment Share on other sites More sharing options...
cworks Posted January 27, 2014 Author Share Posted January 27, 2014 Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" FYI, the Lancer will fit the JP Thermal Dissipator. I have one on mine right now. Not sure about the Carbon Arms guard. If I were to use the Carbon Arms guard, I probably wouldn't even try to vent it. I wouldn't want to compromise the carbon fiber. I can only hope/guess that when Lancer vents theirs, they don't compromise the carbon fiber. The only reason not to go with the Lancer is if you think it will feel too fat in the hand. Mine feels a little fat when compared to my JP modular handguard, but I have gotten used to it. Is the weight reduction that noticeable?? is it solid? did you use the lancer barrel nut? Link to comment Share on other sites More sharing options...
bagdrag Posted January 27, 2014 Share Posted January 27, 2014 I find balance to be more important than weight reduction, but it does feel lighter. I'm not making an apples to apples comparison though as my other AR has a JP medium profile not light like the one with the Lancer has. AFAIK, you have to use the Lancer barrel nut. And so far it seems solid as I'm using irons on mine and the zero has been consistent with it. Honestly, I like it more for looks than anything. If the JP was a little lighter, I'd probably prefer the JP. Link to comment Share on other sites More sharing options...
cworks Posted January 27, 2014 Author Share Posted January 27, 2014 After looking at better pictures of the octagon rail I see the JP nut will not work. Has anyone had issues with sweaty hands on the CF? I am moving to Ft. Benning in 2 weeks so heat is now going to be a factor Link to comment Share on other sites More sharing options...
al503 Posted January 27, 2014 Share Posted January 27, 2014 After looking at better pictures of the octagon rail I see the JP nut will not work. Has anyone had issues with sweaty hands on the CF? I am moving to Ft. Benning in 2 weeks so heat is now going to be a factor I've fondled the Carbon Arms and the AP Custom handguards. The CA has some texture to it. Not a lot, but some. The AP is relatively smooth but all the slots might help a little with the sweaty hands. Link to comment Share on other sites More sharing options...
Chills1994 Posted January 27, 2014 Share Posted January 27, 2014 There was a thread here where a guy made his own carbon fiber handguard/free float tube. You could always add a strip or two of skateboard tape to it if it is too slippery with sweaty hands. Link to comment Share on other sites More sharing options...
cworks Posted January 27, 2014 Author Share Posted January 27, 2014 This sure does look pretty close to a JP barrel nut. Call me crazy but when I bought my SCR-11 they told me they did something special when attaching the barrel. If thats true or not, i don't know but i don't really want to fool with taking the barrel off. Link to comment Share on other sites More sharing options...
michael1778 Posted January 27, 2014 Share Posted January 27, 2014 Which JP handguard do you have on now? They have a newer design (Rapid Configuration) that some have said is a little lighter than the "typical" modular design they have had for years. I have no detailed information about comparisons myself. Also, have you had a chance to contact JP? Whenever I've called them as a potential customer of a finished rifle they have been extremely helpful. Perhaps they could talk to you about modifications that could reduce the weight of the SCR-11? Regardless, I hope you get this all sorted out to your satisfaction. :-) -- Mike Link to comment Share on other sites More sharing options...
a.roberts Posted January 27, 2014 Share Posted January 27, 2014 I think Firebird Precision had a CF handguard that attached to the JP barrel nut. Might see if they're still making them or if they have any laying around? Link to comment Share on other sites More sharing options...
Blaise1 Posted January 29, 2014 Share Posted January 29, 2014 (edited) AP Custom has a new carbon fiber handguard that fits a JP barrel nut and they've also got an octagonal carbon fiber with key mod. If you'll look, the JP heat sink's are no taller than the gas tube so most handguards will work fine with them. Edited January 29, 2014 by Blaise1 Link to comment Share on other sites More sharing options...
bagdrag Posted January 29, 2014 Share Posted January 29, 2014 AP Custom has a new carbon fiber handguard that fits a JP barrel nut and they've also got an octagonal carbon fiber with key mod. If you'll look, the JP heat sink's are no taller than the gas tube so most handguards will work fine with them. Yeah, the handguards that don't fit the JP heatsink usually have the gas tube just underneath the full length top rail. Think MI Gen 2 SS or Noveseke NSR narrow. The Troy Alphas migh have clearance issues too. Link to comment Share on other sites More sharing options...
Jesse Tischauser Posted February 2, 2014 Share Posted February 2, 2014 AP Custom has a new carbon fiber handguard that fits a JP barrel nut and they've also got an octagonal carbon fiber with key mod. If you'll look, the JP heat sink's are no taller than the gas tube so most handguards will work fine with them. Where r u seeing these at? Link to comment Share on other sites More sharing options...
cworks Posted February 2, 2014 Author Share Posted February 2, 2014 I called and emailed Lancer about the heat sink and barrel nut questions....waiting for a response Link to comment Share on other sites More sharing options...
Dave Gundry Posted February 3, 2014 Share Posted February 3, 2014 Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" A fine tooth (32tpi) hacksaw blade works great. There are blades specific for cutting composites, but they can be hard to find. They are basically diamond or carbide encrusted - a fine tooth blade emulates this just fine for rare/occasional use. You darn well better have some special things to cut carbon fiber (more process than tools, from what I gather). The debris can cause lung damage from what I understand. My experience with CF is as a structural designer for submarines and aerospace structures. I only made my own plates a couple of times. I'd personally *never* cut CF myself. Others will surely chime in soon with their experiences. Care is required, but it's not that bad. Flood it with water/coolant if machining or cutting a gross quantity, but for the sake of this thread, a dust mask (fitted properly) is more than adequate. Raw carbon can be extremely fine and hazardous to your respiratory tract, carbon dust impregnated in resin (i.e. after curing) is not as bad. My experience w/CF is based on an engineering degree in Composite Materials Engineering (basically mechanical engineering focusing on composites) and working with it extensively in school, even though I'm a turbine engineer now. When cutting stuff like carbon fiber keep it wet and it keeps most of it contained. Good idea to wear a mask but nothing really fancy. I used to machine a lot of really nasty materials (beryllium/low grade uranium) you don't want to breath. Machined pretty much everything in a flood of coolant. We wore some pretty exotic masks and had an air flow coming from behind us. ^Yup. Do you have to have anything special to cut carbon fiber? I was looking at the Lancer octagon handguard. It's ID is 1.8" and the JP Dissipator appears to be 1.3" FYI, the Lancer will fit the JP Thermal Dissipator. I have one on mine right now. Not sure about the Carbon Arms guard. If I were to use the Carbon Arms guard, I probably wouldn't even try to vent it. I wouldn't want to compromise the carbon fiber. I can only hope/guess that when Lancer vents theirs, they don't compromise the carbon fiber. The only reason not to go with the Lancer is if you think it will feel too fat in the hand. Mine feels a little fat when compared to my JP modular handguard, but I have gotten used to it. The fiber is compromised when cutting, but the effects of a long fiber reinforced composite remain, in this case with fiber lengths >~.5". Continuous fibers are beneficial, but for the sake of a handguard, outside of crushing it, you can poke all the holes you want in it (within reason). Link to comment Share on other sites More sharing options...
carbon9 Posted February 3, 2014 Share Posted February 3, 2014 AP Custom has a new carbon fiber handguard that fits a JP barrel nut and they've also got an octagonal carbon fiber with key mod. If you'll look, the JP heat sink's are no taller than the gas tube so most handguards will work fine with them. Where r u seeing these at? I had a friend who went to SHOT show me some pics of them, they look very nice. I believe they had .308 handguards as well. My friend said they were so new APC didn't have pricing yet. Better looking barrel nut then the Lancer, not sure about function ;-) Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now