PSA 16" CHF M4 Carbine-Length 5.56 NATO 1/7 Dissipator Upper - No BCG or CH

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PSA 16" CHF M4 Carbine-Length 5.56 NATO 1/7 Dissipator Upper - No BCG or CH

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Regular Price: $ 479.99

Special Price $ 279.99

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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 www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

SKU: 5165458745
UPC: 5165458745
MFR#: 5165458111

Barrel length 16" 
Hammer Forged Barrel 
Machine Gun Steel 
5.56 Nato Chamber 
1 in 7" twist 
Double-thick Chrome-lined bore and chamber 
Magnetic particle inspected 
M4 feedramps 
Forged upper 
T-marks

**This Upper Does not include BCG or Charging Handle

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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. 

Our Hammer-Forged Mid-length dissipator uses a "Machine Gun Steel" barrel that is thick chrome-lined for durability and high pressure tested and magnetic particle inspected.

Barrel:  A proprietary blend of Hammer forged chrome molly vanadium made by FN that is referred to as "Machine Gun Steel" by virtue of its use in FN's M249 and M240 weapons.   The hammer forging process work hardens the steel, making it more durable.  In addition, the chrome process for the bore allows for a lining almost twice as thick as a standard M16 for enhanced durability.  Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a carbine-length gas system.   This M4 profile barrel is Mil-spec phosphate coated, High Pressure tested and Magnetic Particle inspected.  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. Featuring machined T marks, and a 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.  Bolt carrier group and charging handle not included.

SKU: 5165458745
SKU 5165458745
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: 5165458745

Questions and Answers

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Browse 7 questions Browse 7 questions and 10 answers
is the gas block under handguards pinned?
Restock T on Jun 13, 2019
BEST ANSWER: No
Can you get me the gun from Rambo?
Orion L on Jun 13, 2019
BEST ANSWER: Move along sir..
How is this have a carbine length gas system when the front sight is so far up on the barrel?
Sam m on Jun 16, 2019
BEST ANSWER: A rifle length gas system won't work with a 16" barrel, so the front sight is not used as the gas block, it is used only as a front sight. "Dissipaters" use a low-profile gas block hidden under the handguards for either a carbine or a mid-length gas system. PSA has various models that use either one or the other. In the industry generally, a mid-length gas system has become more popular. The major practical benefit to the Dissipater is the longer sight radius, but, to me, the cool thing (besides it's looks) is that it is sneaky: sneaky enough to prompt this question!
Is it rifle, mid or carbine GAS length? The description says its all 3 in diffrrent paragraphs.
JohnV on Jun 13, 2019
BEST ANSWER: the description clearly says this upper uses Carbine Length Gas.
What height rear sight works with the front sight on "dissipator" upper?
Doug L on Jun 18, 2019
BEST ANSWER: Honestly that depends on wether or not the front sight base is F-Marked or Non F-Marked. If it’s F-Marked, than any back up rear iron will work. If it’s Non F-Marked, than you’re looking at an A 1/2 fixed carry handle upper, or the wild card being RRA UTE2 upper. You can use carry handle uppers with F-Marked front sight bases, but if you do I would suggest a new Front Sight that is extended to make up the different in front sight bases (.40” taller on the F-Marked due to it being designed with use on flat top uppers) KNS precision has an extended Front sight that is .072 dia (the mil-spec Sight diameter.)
Can you remove the front sight to put a free floating hand guard?
Gmoney on Jul 21, 2019
BEST ANSWER: I don't see why not? Shouldn't be an issue... front sight at rifle-length position isn't directing gas, just simply there to give shooter rifle length sight radius, while a low profile gas block under handguard actually handles the gas operation.
What barrel profile is this, beneath the handguard hbar?
william m on Jun 17, 2019
BEST ANSWER: M4

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