I'm sure someone more experienced here can help. I am looking for a dissipator / mock dissipator upper in 5.56/.223, but can't seem to find the type I am looking for.

 

Is it possible to get a lightweight barrel, midlength gas system, and rifle length handguards (or rail) with a standard sight block at the full length? Is there something inherently wrong with this setup...? I'm thinking that maybe this is why I can't find one.

 

Otherwise, Could I just get a lightweight midlength upper, with midlength gastube, without a front sight block? With this setup could I just use a rifle length handguard and mount a flip up front sight at the full length and make a 'mock' type dissipator?

 

Any help or links would be appreciated.

 

Thanks

The Dissy uppers have a gas block location further forward then the mid-length. Today there is really no advantage to a dissy upper. However i think they refer to them as rifle length not dissipator anymore.

 

What is it that your looking for? an extended handgaurd? The FSB must be located at the gas port on the barrel.

 

Basically today, if im thinking what you want... doesn't matter what barrel you get, u just need a low profile gas block and the handgaurd(free float) to match the overall distance you want, you can mount a sight to the end of the barrel, but i wouldnt and depending on barrel profile u may run into mounting problems, i would use a sight that attaches to the end of the rail, which will shave some weight.

 

check out this thread

http://www.ar15.com/...&f=118&t=526645

I think CMMG makes one. You can get it in either mid or carbine length gas system I think.

I just looked at their site. For some reason they have a lot less upper to choose from now. They do sell a complete dissy rifle.

 

http://cmmginc.secure-mall.com/item/CMMG-16-inch-Hammer-Forged-M10M-1778

 

You can call to see if they still sell a dissy upper.

 

The only other company I know of that sold dissy uppers were ADCO and Bushmaster.

I think CMMG makes one. You can get it in either mid or carbine length gas system I think.

http://cmmginc.secur...orged-M10M-1778

 

Edit: Beat me to it lol

The Dissy uppers have a gas block location further forward then the mid-length. Nope only the FSB is forward, most of them are mid-length gas systems with a lo-pro gasblock under the handguards Today there is really no advantage to a dissy upper. Longer sight radius when using iron sights, and more handguard real estate However i think they refer to them as rifle length not dissipator anymore.

 

 

What is it that your looking for? an extended handgaurd? The FSB must be located at the gas port on the barrel. Negative, the FSB can be put anywhere on the barrel w/ the use of a lo-pro gas block

 

Basically today, if im thinking what you want... doesn't matter what barrel you get, u just need a low profile gas block and the handgaurd(free float) to match the overall distance you want, you can mount a sight to the end of the barrel, but i wouldnt and depending on barrel profile u may run into mounting problems, i would use a sight that attaches to the end of the rail, which will shave some weight.

 

check out this thread

http://www.ar15.com/...&f=118&t=526645

 

Palmetto State has a few Dissipator uppers http://palmettostate...lete-uppers.php

Spikes is the only one I know of that makes one with a LW barrel though http://www.aimsurplu...tem=xstu5950moe

 

 

Do you have any experience with Palmetto State and their products? Are they on par with Spikes/BCM?. I want to build a dissipator but never found the upper I liked but this one seems to fit the bill.

 

thanks!

 

Palmetto State has a few Dissipator uppers http://palmettostate...lete-uppers.php

Spikes is the only one I know of that makes one with a LW barrel though http://www.aimsurplu...tem=xstu5950moe

 

 

So it seems that the PSA brand uppers all have a heavy barrel type, and that Spikes one is out of stock. The Spikes one looks exactly the kind of thing I was thinking of though.

 

If I have a low profile gas block then, I can still use a rifle length rail / foreend?

You can still use rifle length rail on these but with one piece forend I believe the FSB has to come off to install one.

Palmetto State has a few Dissipator uppers http://palmettostate...lete-uppers.php

Spikes is the only one I know of that makes one with a LW barrel though http://www.aimsurplu...tem=xstu5950moe

You can just use an extended handgaurd if you want a longer sight radius( thus making it pointless to mount more stuff to the barrel), and depending on the profile of the barrel you may not be able to mount a fsb at the end of the barrel, you would have to make sure it meets the .750 requirement at the muzzle end, and most gov and lightweights are not per OP request.

 

Tons of companies make 12" rails that will accomplish the same thing, while reducing weight. But yes now i see that the dissy is a carbine/mid gas system.

 

The only reason u might want to do this is for the look of the fsb at the end of the barrel, other then that there are much better options for more handguard space and longer sight radius

The main reason you can't find many people offering a dissy setup with a lightweight barrel is that most light weight barrels are turned down in front of the gas block, so you have to do something to make a standard front sight tower fit, or use something other than a stock front sight tower that can deal with the reduced diameter.

So it seems that the PSA brand uppers all have a heavy barrel type, and that Spikes one is out of stock. The Spikes one looks exactly the kind of thing I was thinking of though.

 

If I have a low profile gas block then, I can still use a rifle length rail / foreend?

Yes if you have a legit low pro gas block then u can mount any rail that you want over it. A word of caution tho, if using a muzzle device you will not be able to switch rails(barrel nuts) once its perm. attached since the lo-pro blocks slide on. So make sure if you go that route your satisfied with how it looks and functions or prepared to ruin a muzzle break since most companies are designing their own barrel nuts.

 

Yes if you have a legit low pro gas block then u can mount any rail that you want over it. A word of caution tho, if using a muzzle device you will not be able to switch rails(barrel nuts) once its perm. attached since the lo-pro blocks slide on. So make sure if you go that route your satisfied with how it looks and functions or prepared to ruin a muzzle break since most companies are designing their own barrel nuts.

 

Or you could go with a Nordic tactical comp, which the gas block will fit over.

Or you could go with a Nordic tactical comp, which the gas block will fit over.

 

ahh good point!, some comps are the same diameter as the barrel, in which case you wouldn't have to worry.

I think I figured out what I'm going for. I think i'm going for the free float Troy battle rail 15" with a flip up sight at the end.

http://store.troyind...eli-15bt-xx.htm

 

I can use this over a midlength lowpro gasblock and get the sight profile i'm looking for on a 16" lightweight barrel. I'm excited. Going to go for this and a cmmg .22lr upper and I'm set for a short while .

 

Thanks Guys!