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


Quick Overview

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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 7 questions Browse 7 questions and 10 answers
Is this barrel .750 inch diameter at the gas port?
Aaron N on Oct 10, 2018
BEST ANSWER: Yes it is.
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.
Does this require a special BCG?
Bryan H on Oct 10, 2018
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


4.4 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
4 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
4 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
4 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
4 months ago
Dissipator Upper
Excellent product and value.
December 11, 2018
4 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
4 months ago
Dissipator Upper
Like the looks of this upper, put it together with a PSA lower kit. Took it to the range, it shoots great. The dissipator upper is a great deal for under $200.
My dissipator build
My dissipator build
December 10, 2018
4 months ago
Quality product
Recently received my psa Dissipator upper and was very pleased with the quality of the build. Very solid piece and can't wait to get to the range.
December 9, 2018
4 months ago
Great Buy
This is a great shooting upper. A 16" barrel with rifle length sights. What more could you ask for? I only have a few hundred rounds through it so far, and at 100 yards, it is very accurate with 55 and 62 grain bullets. Used a bolt from another rifle and I have not had any FTF or FTE.

When sighting this guy in, my front sight post had to be turned up very high to bring the bullet onto target. I had to use a +.060" front sight post to be able to back the sight into what I call normal range. It is all abought personal preference
I have one of these from another manufacturer and have always wanted another. I put this one on an A2 upper. Other then the barrel isn't chrome, it is the same rifle at a great deal and for a lot less money. Buy this guy, you will not be disappointed.
October 10, 2018

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