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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Regular Price: $ 259.99

Special Price $ 179.99

Quick Overview

free shipping Free Shipping applies to this item only and not the entire order.

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 (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
Daily Deal No
Daily Deal Expires 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 17 questions Browse 17 questions and 28 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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Is this barrel .750 inch diameter at the gas port?
Aaron N on Oct 10, 2018
BEST ANSWER: Yes it is.
Do you have this with a carbine gas system?
D S on Apr 25, 2019
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.
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
Do the handguards have any heat shielding?
Carl C on Oct 20, 2018
BEST ANSWER: Yes they do
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.
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.
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: it's 16" and threaded
Does this require a special BCG?
Bryan H on Oct 10, 2018
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 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 upper accept triangle hand guards?
randall b on May 6, 2019
BEST ANSWER: Mine came with a triangle forend cap so, they should fit.
Are the handguards mid length or rifle handguards? Thanks!!!
UniformTango74 on Apr 25, 2019
BEST ANSWER: Says rifle length in the description..
Would this be Maryland legal?
thomas b on Apr 24, 2019
BEST ANSWER: This is upper does not have a heavy barrel.
Will this dissapator fit the Bushmaster xm-15 patrol man 90289 model ?
Oldmogse on May 24, 2019


4.4 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Excellent! Excellent! Excellent!
I purchased this "mock dissipator" and a PSA carry handle about two weeks back and received everything on May 14th which happened to be my birthday.

The upper is perfect and free from any blemishes which a deep black color. The barrel was excellent inside and out like one would expect and it mated up to a spare Anderson lower nicely. Very little play between receivers and the finishes match perfectly.

I added a AIM v2 BCG that I had as a spare and it head spaced perfectly. Changed out the hand guards and went with a set of Brownells A1 retro furniture and one of their retro 3 prong flash hiders and the rifle feels, looks, and runs great.

Once again I am a very happy PSA customer.
User submitted image
User submitted image
User submitted image
User submitted image
May 21, 2019
3 weeks ago
Dissipator Upper
Looks good Quality , ( Should have bought it Complete ) .
May 11, 2019
1 month ago
Upon receiving a new upper, I always disassemble to check everything and to clean. I noticed the FSB was canted, as well as the gas tube. No big deal, I could straighten that out. Out of the box, the barrel was only torqued to ~20 ft-lbs, just over half of what it should be. I found out the reason why was because the assembler couldn't get the gas tube to line up with the slot in the barrel nut without severely over-tightening, so they left it loose. Without wanting to over-torque and ruin the receiver barrel threads, I decided the best plan of action was to try a different barrel nut. I had to remove the flash hider, FSB, and gas block and tube to remove the old barrel nut, to swap with a different one. That did the trick. I reassembled everything plumb, and to spec, and went to fire. This particular upper wouldn't cycle Federal American Eagle .223 with an H2 buffer, so I moved back to a carbine buffer and it cycled fine. When inspecting brass, there were "rings" around it, where the chamber was machined rough and not polished properly. I cleaned the chamber with a brass chamber brush and re-lubed. I do expect the upper to function fine, and the chamber to smooth out after more use. Perhaps then it will work with a little heavier buffer. Overall I would recommend, but be prepared to have to do a little work to it. If you don't have the means to do so, PSA's customer service will take care of you.
May 10, 2019
Love the Dissi!
Now my AR collection’s complete. Love seeing the “Dissi” thigh I wish it had a 1:8 or 1:9 twist. I usually use 55gr 556s and I see a difference past 100 yds. Other than that, practical accuracy seems very good!
March 3, 2019
7 months ago
Loving the dissipator look!
Perfect for my retro modern build. Stuck a detachable carry handle on it with an A2 stock on the lower. M16A4 looks with a shorter barrel
December 17, 2018
7 months ago
Nice for the price!
Nice quality for the price, soft shooter with a heavy buffer installed. Great value, I would recommend.
December 14, 2018
7 months ago
Looks Good But Front Sight Not Square
The Dissipator perfoed and shot well. However am to pleased with the way the A2 front sight post was installed. It canted 1/32" to the right. Not noticeable at first glance but very noticeable at the range.
December 13, 2018
7 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
December 13, 2018
Casey S
Thank You PSA
Exceptional Quality for the price
December 11, 2018
7 months ago
Dissipator Upper
Excellent product and value.
December 11, 2018
7 months ago
Good alternative to Custom Build
Great manufacturing, but without a front sight tool for the fixed front sight, getting an accurate shot is difficult. Uses the same Freedom 1/7 5.56 barrel I have in my custom build. Great alternative if you’re looking for a classic look with a rifle-length sight radius. Not the best for home defense, but works great as a beat-em-up classic AR15 option.
After installation of Magpul parts and A2 carry handle
Top: Dissipator upper in stock form with A2 Carry Handle
Bottom: Custom 16” upper w/ most PSA parts
User submitted image
December 11, 2018
7 months ago

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