dissipator barrel assembly

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PSA 16" Mid-length 5.56 NATO 1/7 Nitride MOE Dissipator Upper, Black - No BCG or CH - 5165449716


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WARNING: This product can expose you to the chemical lead, which is known to the State of California to cause cancer and reproductive harm. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

SKU: 5165449716
UPC: 5165449716
MFR#: 5165449716
  • 16" Barrel Length
  • .750" Gas Block Diameter
  • Mid-length Gas System
  • 4150V Chrome Moly Steel Barrel; Nitride
  • 5.56mm NATO Chamber
  • 1 in 7" Twist Rate
  • M4 Feed ramps
  • A2 Flash Hider
  • 7075 Forged Upper Receiver
  • Magpul M-Lok Rifle Length Handguards, Black

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Once upon a time, a "dissipator" AR was created by taking a 20" rifle-length gas system upper and cutting the barrel down to 16".  This allowed the shooter to keep the long sight radius of a rifle for accuracy, but keep the carbine length barrel for maneuverability.  The proximity of the gas port to the muzzle, however, played havoc with timing and made reliability a hit or miss proposition.   Advances in AR technology  have produced reliable carbine and mid-length gas systems, that can be hidden using low-profile gas blocks.  This allows for a front sight base to be pinned in the rifle position for the longer sight radius without the worry of the unorthodox gas port location affecting operation.  We use the term "mock" to differentiate our dissipator from a cut-down rifle length version.  

Barrel4150V chrome moly steel.  Nitride treated and chambered in 5.56 NATO with a 1/7 twist rate, M4 barrel extension, mid-length gas system, and a low profile gas block under the handguard.  Barrel is  is finished off with a Black MOE M-Lok rifle-length handguard, F-Marked front sight post, and an A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability, mil-spec finish. These uppers are made for us right here in the USA by a mil-spec manufacturer.

Each upper is assembled to order with care, and test fired.  

**BCG and Charging handle are not included.

SKU: 5165449716
SKU 5165449716
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165449716

Questions and Answers

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Browse 13 questions Browse 13 questions and 25 answers
For this dissipator upper, what is the barrel profile ? Is it HBAR ? or other ??
tom j on Nov 18, 2018
BEST ANSWER: standard A2 govt profile under handguards. mid-length gas, no M203 cuts. great setup for those on the move.
If I buy an AR upper from you that does not include a bolt carrier group and buy one from you. do you headspace it to the upper?
old man on Nov 18, 2018
BEST ANSWER: Headspace on new manufacture, with parts from the same manufacturer, is not an issue. I have used different mfg barrel and bolt, all new, and never had a headspace issue in the literally, hundreds of times i have combined the two. YMMV. But don't over stress about headspace with new mfg. With moderately to heavily used bolt or barrel, Yes... at least check it.
Is the hand guard flat at bottom for rail mounting?
David F on Nov 16, 2018
BEST ANSWER: Yes, handguard is MLOK compatible. With enough care, you can attach MLOK accessories without removing the handguard. Easy to do!
Will the triangle hand guards fit on this?
Jay S on Nov 17, 2018
Will headspace be correct if I use a BCG from another 5.56 AR?
David R on Nov 17, 2018
BEST ANSWER: If it is new and hasn't been used, I would use it and I have literally hundreds of times without issues. YMMV. Ideally, it is a good idea to check headspace.
So the gas system has nothing to do with the front sight post???
Jeff R on Nov 24, 2018
BEST ANSWER: On this particular upper the answer to your question is no. The front sight post on this upper acts as a front sight only. If you magnify and study the picture carefully you can see that the front sight post does not have the gas tube roll pin installed on it. Palmetto should post an additional picture of this upper with the rifle length hand guards removed so people can see the low profile gas block placed at the mid-length position. This would cut down on a lot of confusion and would also show what profile the barrel has to it as well.
Manufacturer of the barrel?
Scott S on Dec 5, 2018
BEST ANSWER: Im told FN. Its heavy profile and accurate.
Beeing the front sight only is used for a fixed sight only, can it be removed to add a guard rail to it if one wished to change in future builds?
Jr S on Nov 26, 2018
BEST ANSWER: Yes it can with minimal hassle but handguard setup will no longer work
Can I use this "dissipator" upper with a CMMG .22lr conversion kit?
Michael B on Nov 19, 2018
BEST ANSWER: Yes. However, 1-7 twist barrels "might" get more lead build up in the rifling when using .22LR.
Is this a Rifle length gas system?How can you have a rifle length handguard with carbine length gas system?Look at the picture it's way to close to the end of the barrel for mid length.
kyle v on Nov 22, 2018
BEST ANSWER: There is a low profile gas block under the hand guard at the mid length position. This IS a mid length gas upper. It just has the front sight block pinned to the rifle length. Hence, why it is called a dissipator upper.
Will round Style handguards fit this upper?
Scott B on Dec 3, 2018
BEST ANSWER: It depends. This has the triangular front handguard retainer. Your handguards might have the grooves in front that allow installation on either round or triangular front retainer.
What is the thread for the flash hider? would like to remove it and fit a new one
Kyle T on Nov 30, 2018
BEST ANSWER: Probably 1/2 x 28. Pretty much standard for 5.56/.223 AR.
Is the 7244 lower compatible with the PSA 16' Mid-Length 5.56 NATO 1/7 Nitride MOE Dissipator Upper?
Lisa M on Nov 24, 2018
PSA 16
PSA 16" Mid-length 5.56 NATO 1/7 Nitride MOE Dissipator Upper, Black - No BCG or CH - 5165449716
PSA AR-15 Complete Classic Lower - No Magazine - 7244
PSA AR-15 Complete Classic Lower - No Magazine - 7244


4.8 / 5.0
31 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Best barrel I have
I love the disipator barrel for the extra long sight radius. Only thing I could have asked for is a Wylied chamber.
May 8, 2019
7 months ago
Great build. Side effects: beard growth and increased manliness.
Paired it with a cmmg lower, flawless function. Great accuracy and the dissipator feel is wonderful. Makes shooting with iron sights so fun. Side note: as soon as I installed this upper I grew a full beard and my Glock turned into a 1911. Not sure if its related.
February 26, 2019
Mostly bought this product because I already had a lower and needed an upper couldn't beat the price psa's always had good quality went to the range shot about 300 rounds through it not one problem very accurate
January 29, 2019
6 months ago
Worth every penny and great reliability
Great upper couldn't go worng for black Friday deal 169.99 and very comfortable
Great upper couldn't go worng for black Friday deal 169.99 and very comfortable
January 28, 2019
6 months ago
Great upper!
Product was as described. Good quality materials. I have shot several hundred rounds through the upper and it functioned perfectly. The longer sight radius makes the upper a little more accurate compared to standard carbine length upper. I like to grip further out, closer to the muzzle, with a c clamp grip. More accurate shooting and I’m able to get the right extended grip with my flashlight attached to the handguard.
January 27, 2019
6 months ago
Great upper for the price.
January 27, 2019
6 months ago
Good quality great price
Bought this upper and built one. Shot pretty dang accurate before adjustment
January 27, 2019
7 months ago
Excellent products
I have invested a bit of money in your products. Have not been disappointed with anything. Quality is great!
January 26, 2019
7 months ago
The key to my retro budget dissipator build.
If you see this OPPORTUNITY & have always wanted a dissipator; BUY IT! The quality is definitely there functioning flawlessly & at the price all the options are yours. Between this DEAL a BIg parts site & online auctions I was able to turn $300 into a QUALITY retro dissipator I've wanted for years but wasn’t spending on. Now I have a quality rifle that feels awesome (& it wasn’t 4 figures) in my hands holding down a ski condo I’m beyond greatfull to PSA!
Going into storage...
Going into storage...
January 25, 2019
7 months ago
Dissipator upper
These are great! The longer sight radius helps with accuracy and I like the balance of this upper.
January 24, 2019
7 months ago

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