side view of ar-15 m-lok barreled upper

More Views

PSA 18" CHF Mid-Length 5.56 NATO 1:7 Heavy 15" Precision Lightweight M-Lok Upper, No BCG or CH - 516444448


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: 516444448
UPC: 516444448
MFR#: 516444448
  • Barrel Length: 18"
  • Gas System: Mid-Length
  • Barrel Profile: Heavy
  • Barrel Steel: Hammer-Forged Chrome Moly Vanadium ("Machine Gun Steel")
  • Chrome Lining: Yes
  • Muzzle Thread: 1/2-28
  • Chamber: 5.56 NATO
  • Twist Rate: 1 in 7"
  • Barrel Extension: M4
  • Diameter at Gas Block: .750" 
  • Gas Block Type: Low-profile
  • Muzzle Device: A2 Flash Hider
  • Receiver Material: Forged 7075 T6
  • Receiver Type: M4
  • Handguard Type: PSA Precision 15" M-Lok Lightweight Rail
  • Bolt Carrier Group Included: No
  • Bolt Steel: N/A
  • Bolt Carrier Profile: N/A 
  • Charging Handle included: No 

Add To:

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 required 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 Mid-length gas system. This 18" heavy profile barrel is Mil-spec phosphate coated, High Pressure tested and Magnetic Particle inspected. The barrel is finished off with a 15" PSA Precision Lightweight M-Lok free float rail and an A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is hard coat anodized black for durability. Featuring T-marks, these upper receivers are made for us right here in the USA.

Each upper is assembled to order with US-made parts, and test fired to check gas function. Does not include bolt carrier group or charging handle.

SKU: 516444448
SKU 516444448
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: 516444448

Questions and Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 14 questions Browse 14 questions and 47 answers
Is the barrel marked FN?
Tony621 on Jun 7, 2018
BEST ANSWER: 18” was stamped with the FN logo and also HF MP 5.56 NATO 1/7
Are the set screws in the gas block red loctited in?
Franky on Oct 5, 2018
BEST ANSWER: I don’t believe so, you’ll have to lock the screws down after purchase. It’s the only thing that could be considered a flaw in the system. I’m very pleased with the purchase, especiallly for the price.
Well that went fast. Saw this on my coffee break and when I came back to it at lunch with my credit card it was sold out. Anyone know how long before it’s back in stock?
Lawrence on Feb 8, 2019
BEST ANSWER: One Year...
Does the barrel get thinner under the handguard?
klist m on Apr 24, 2019
BEST ANSWER: No heavy barrel full length :-)
Very nice upper
Is this free float?
Todd A on Feb 19, 2019
BEST ANSWER: If by free float you mean the handguard mounts to the reciver and doesn't touch the barrel yes
is this considered an Hbar? i know the profile says heavy, but the last one i looked at said heavy but in the comments they said not an Hbar
Mullin on Jun 12, 2019
BEST ANSWER: This is a heavy profile FN made Chrome Hammer Forged Barrel. It’s a beast. I love mine. It’s worth the price Palmetto State is asking by itself. I put an Acog on mine and use it for predator hunting.
what is the best type of ammo to throw through this barrel?
grant j on May 20, 2019
BEST ANSWER: Mine likes 77grn Sierra Match Kings.
What is the barrel profile? It says heavy but i thought i read before that these were government profile
Rotti on Oct 28, 2018
What kind of groups does this get with quality ammo? I'm asking users that put an actual scope not people that put a 2moa red dot on.
mack g on Nov 28, 2018
BEST ANSWER: The accuracy of my upper has actually increased after a hundred rounds, typically 3/4 of an inch at a hundred yards with quality ammunition, I find this more than adequate for my intended purposes. The heavy profile barrel is not so heavy as to be a burden. I think PSA is the best value on the market.
Is the barrel profile socom profile?
Juan B on Nov 8, 2018
BEST ANSWER: It appears to be a government contoured heavy barrel
Is the gas block pinned..?
Timothy T on Jun 6, 2018
BEST ANSWER: No, the two I received had gas blocks that were attached with two set screws on the bottom. I put them both on FNH upper receivers and it was an easy swap with these blocks. Grab some blue Locktight, there was none on my set screws.
Will this upper with the mid length gas system run steel case ammo fine???
Nirav P on Jul 2, 2018
BEST ANSWER: Don't Be - Penny Wise and Pound Foolish. Of course the upper will run steel cased ammunition. What you might want to consider is the accuracy and effectiveness of that steel cased ammunition.
The title and description say rifle length gas but the description of the barrel says mid-length gas and the photo kinda looks mid-length. So which is it?
Tim M on Jun 6, 2018
BEST ANSWER: Mid length
This question is for PSA. When will this upper be back in stock? Been out of stock for at least a month now.
YouFirst on May 22, 2019


4.8 / 5.0
26 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
!8" CHF Barreled upper
In the short time I have had this upper, it shows solid quality, with good accuracy, reliability, and very good velocity... I chrono'd several common rounds and had higher velocities than barrels longer than this one. Should make for a dependable long range shooter, that can handle the heat better than some lighter profile barrels in it's class
July 2, 2019
2 months ago
Gas block was not aligned correctly and luckily I had an armorer's wrench, but still has over gassing issues. Upper receiver doesn't fit tight (never does) and even with an accu-wedge has some play. The only thing it's good for is the barrel but you would have to buy new receiver and build from scratch for it to be what you want.
June 18, 2019
3 months ago
Excellent quality and value!
Great barrel. Shoot groups of 1.5” at 100 yards. Best of 1” with Federal 55 grain. Haven’t tried match ammo yet. Imagine you could do better with a match ammo and trigger as well. Very pleased with the quality of the m-lock hand guard and performance of the barrel. I’ve shot many uppers that were much more expensive than this and not as well-built. If I buy another it’ll definitely be from PSA.
June 16, 2019
5 months ago
18 Inch CFH Heavy barrel upper
Great upper the handguard was tight, the gas tube and block were installed properly and it shot good groups while I was sighting it in. I would buy again.
Barrel marking
User submitted image
June 8, 2019
4 months ago
This is my 3rd build from Palmetto and I couldn’t be happier. Great quality. I have 300 rounds through it w/o any problems.
User submitted image
Added Jun 8, 2019
June 8, 2019
2 months ago
Great upper for the money.
Nice upper, good accuracy, FN made barrel. Fit and finish was pretty good. One small imperfection in the color of the barrel, but it is hidden by the hand guard so it is difficult to spot. Nice shooter for the money. Trigger is ok, better than mil spec, but will be upgraded soon, maybe to a Hyperfire.
May 28, 2019
3 months ago
Good Product and Price.

Yes! I Will Would Recommend.
May 19, 2019
3 months ago
You need this in your toolbox.
This upper is the future. If reaching out to 600 yds with energy on target is bottom line, this the solution. Flawless build. My second upper fro PSA. No fail. No jams. Highly recommend.
PSA Uppers: .224 Valkyrie 18” and 5.56 NATO 18”.
PSA Uppers: .224 Valkyrie 18” and 5.56 NATO 18”.
May 11, 2019
4 months ago
About 500 rounds no fte ft. Bcm buffer tube makes the recoil impulse buttery. Tack driving sewing machine.
May 1, 2019
7 months ago
Solid,dependable,accurate upper that will outlast the owner
Assembly done with care. Milspec upper but no t marks on the one I received. If you want the marks make sure you check your upper and call psa if it doesn’t. FN marked barrel. Nice accurate set up that you will be happy to own.
April 12, 2019
5 months ago

Customers Who Viewed This Item Also Viewed