PSA 16" Mid-length 5.56 NATO 1/7 Nitride Dissipator Upper - Black- No BCG or CH - 5165449779

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PSA 16" Mid-length 5.56 NATO 1/7 Nitride Dissipator Upper - Black- No BCG or CH - 5165449779


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WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to (CA Health and Safety Code Section 25249.6).

SKU: 5165449779
UPC: 5165449779
MFR#: 5165449779


  • Barrel length 16" 
  • 4150V Chrome Moly Vanadium Barrel 
  • Nitride Treated
  • 5.56 Nato Chamber 
  • 1 in 7" twist 
  • M4 feedramps 
  • Forged upper

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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. 

Barrel:  4150V Chrome Moly Vanadium Steel.   Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a Mid-length gas system. This A2 style profile barrel is nitride treated for accuracy and durability.   Barrel is finished off with a pinned F-marked front sight post in the Rifle position with sling swivel,  rifle length handguards, and an A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability.  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. 

Bolt carrier group and charging handle not included.

SKU: 5165449779
SKU 5165449779
Brand Palmetto State Armory
Department Uppers
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165449779

Questions and Answers

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Browse 27 questions Browse 27 questions and 78 answers
Are there plans for dissipator uppers to be back in stock in the reasonably near future or are they gone for good?
Peter T on Mar 12, 2019
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BEST ANSWER: They're back, and back in force!
Will you ship these to California?
BERNARD C on Sep 10, 2019
Do you have this with a carbine gas system?
D S on Apr 25, 2019
BEST ANSWER: They do offer this in carbine. Just search “dissipator” and you’ll find it.
Is this barrel .750 inch diameter at the gas port?
Aaron N on Oct 10, 2018
BEST ANSWER: Yes, it resembles an A2-profile barrel. It's not an M-4 barrel, and the gas port is at a mid-length position under the handguards.
Can you put triangle handgaurds on this?
J J on Jun 3, 2019
BEST ANSWER: Yes. Brownells and original fit with slight modification to the handguards near the front sight where the faux gas tube pin is.
If I buy this I will replace the handguards for MLOK. Which ones will fit this?
David H on Oct 14, 2018
BEST ANSWER: The rifle length will go all the way to the front sight
Can you use an A2 fixed stock lower/ buffer/ and spring with the Dissipator Upper and cycle reliably or will I have to use a different buffer with different weight to it?
Joshua W on Oct 31, 2018
BEST ANSWER: Yes you can. I run one on a rifle length system and another on a carbine length system. The mid length gas system works great on both platforms.
Enough space to properly mount an M7 bayonet?
Lee B on Oct 14, 2018
BEST ANSWER: No, tried it...lacks room for bayonet and handle.
Is the low profile gas block pinned or is it held in place with a set screw?
David M on Apr 25, 2019
BEST ANSWER: Set Screw. I recommend doing a deeper dimple and loctite the set screw. Of course pinned gas block is the best option.
Do the handguards have any heat shielding?
Carl C on Oct 20, 2018
BEST ANSWER: Yes, and while they're more vertically oval in profile than G.I., the handguards are very comfortable.
Are the handguards mid length or rifle handguards? Thanks!!!
UniformTango74 on Apr 25, 2019
BEST ANSWER: Says rifle length in the description..
Can I put magpul handguards on this? I would like it to all the way to the sights like the ones on it already
Benjeramin on Dec 26, 2019
BEST ANSWER: Rifle length Magpul MOE hand guards will fit on this upper perfectly , When You remove the standard hand guards You will notice the low profile gas block and a Mid Length gas tube , This is the same upper as the M-16 A2 upper with the 20 inch barrel , With the barrel cut down and a mid length gas system installed , The rifle length hand guards are exactly the same
Is the A2 sight pinned or set screwed on?
Philip T on Dec 9, 2019
BEST ANSWER: The Front Sight is pinned and the gas block is set screws.
Is it an F marked front sight base?
Brad on Feb 7, 2020
BEST ANSWER: Yes, it is.
The description says A2 style barrel.. does this mean the heavy barrel profile (no machining and same thickness throughout) and not the M4 profile???
Security Pro on Apr 25, 2019
BEST ANSWER: Standard AR15 mid-length barrel. Machined to .680 from chamber to shoulder at gas block. Not heavy profile.
Is this actually a 16" barrel or is it a 14.5" with the flash hider silver soldered?
John R on Dec 4, 2018
BEST ANSWER: Mine came with a 16inch barrel with standard 1/2x28 threads under the flash hider.
Does this require a special BCG?
Bryan H on Oct 10, 2018
are the upper t marked??
Dylan W on Oct 6, 2019
Is this a FN barrel like most other barreled upper sets from PSA?
Daniel B on Aug 17, 2019
BEST ANSWER: This is not the chrome lined fn barrel from their premium line
is the front hand guard retainer round or triangle?
randall b on May 7, 2019
BEST ANSWER: Mine came with a triangle handguard end cap.
will this upper accept triangle hand guards?
randall b on May 6, 2019
BEST ANSWER: Yes it will I fit the brownells retro guards on mine should be a picture in reviews
Will the front hand guard retainer work with the classic triangular hand guards?
Hodgie on Apr 25, 2019
BEST ANSWER: It should. I had to do some mods to get Magpul to fit, but classic triangle should drop right in.
Will this dissapator fit the Bushmaster xm-15 patrol man 90289 model ?
Oldmogse on May 24, 2019
BEST ANSWER: Yes, and that would be a great combination.
Would this be Maryland legal?
thomas b on Apr 24, 2019
BEST ANSWER: This is upper does not have a heavy barrel.
Will a KAC M5 RAS fit on this? The rifle length quad rail?
jrhvy on Feb 19, 2020
BEST ANSWER: I tried, it doesn’t fit because the spot where the gas tube would go has a screw in it. The screw head size prevents the M5 from mounting. I’m tempted to remove the screw and grind down the head a bit.
Will the DD ris ii fit with the front post attached?
Isaiah R on Aug 22, 2019
BEST ANSWER: Basically, if interchangeable with rifle/M16 length handguards, then yes. Now if that's a free float handguard you're referring to, there's potential semi-in depth labor involved and possible front sight removal anyway, I can't remember which exact DD model that is at the moment.
Will there be A1/A2 upper receiver versions?
S M on Jun 2, 2019


4.5 / 5.0
46 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Looks great on my a1 lower!
March 22, 2020
4 months ago
Good upper but I'm pretty sure it's not normal rifle length
I had to do some serious filing to the front of a Magpul MOE rifle length handguard to fit in this upper!
I mean serious filing to the point where the front of the handguard is almost flat now!

Other than that the upper works fine.
March 14, 2020
1 year ago
Great Entry-Level Upper
I got one of these because you can't beat the price and because I've always been a fan ot the superior sight radius of the Dissipator style upper. So far (around 300 rounds), it's holding up well. I haven't treated it gently or babied it in any sense, and it's still holding groups in the 2-3" neighborhood with decent ammo at 100 yards using a Millett red dot. I put this upper on an A2-stocked rifle lower, and the balance and overall handy length is very appealing. I'd recommend this to a friend, and overall quality is excellent, not just for the price.
March 4, 2020
4 months ago
It looks good and shoots good as well. You can't beat the price either.
March 3, 2020
4 months ago
Great upper! Great start for a build. Wish for more upper receiver options at PSA prices.
-Great value! Melonite bore will double the life of the barrel without spending for a chromed lined bore.

-Rifle length iron sights.


- Upper receiver. I wanted a m16a2 upper receiver to compliment this upper. Not available on PSA. Would be a great option PSA! So I added one myself.

- Handguards. I hope PSA also starts to stock retro handguards.
March 1, 2020
4 months ago
Good buy
Great upper. Good quality. Very satisfied with purchase
February 26, 2020
4 months ago
Almost great.
Looks good, shoots good. But, as some other reviewers posted, the front sight is crooked. I was still able to zero it with the carrie handle rear sight but it is all the way to the left. If it wasn't for that, I would have given it 5 stars.
February 20, 2020
5 months ago
If you like to roll your own, this upper is perfect for your next build.
Very nice upper. I put a A1 upper receiver and triangle handguards on it . It mounted up tight on a PSA lower . It shoots great and so far it hasn't jammed once .(200rds). If you want to build something a little different this is for you. I am happy i did . I now have a nice new old style rifle thangs to PSA.
Put A1 receiver and triangle handguards on it.
My new old style rifle
February 6, 2020
1 year ago
The front sight was mounted a little off. I fixed it. For the price its a good bargain.
December 14, 2019
7 months ago
Great parts and a price that can't be beat
Great quality part's and a big selection to choose from
November 10, 2019
8 months ago

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