PSA 10.5" CHF Pistol-Length 300AAC Blackout 1/8 9" Lightweight M-Lok Upper - With Nickel Boron BCG & CH - 5165448092

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PSA 10.5" CHF Pistol-Length 300AAC Blackout 1/8 9" Lightweight M-Lok Upper - With Nickel Boron BCG & CH - 5165448092


Quick Overview

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

It is the customer's responsibility to be aware of all applicable laws and regulations regarding the purchase and ownership of uppers with a barrel length of less than 16". Federal NFA regulations are applicable to this item.

SKU: 5165448092
UPC: 5165448092
MFR#: 5165448092
  • Barrel Length: 10.5"
  • Gas System: Pistol-Length
  • Barrel Profile: Heavy
  • Barrel Steel: Hammer-Forged Chrome Moly Vanadium ("Machine Gun Steel")
  • Chrome Lining: Yes
  • Muzzle Thread: 5/8x24
  • Chamber: 300AAC Blackout
  • Twist Rate: 1 in 8"
  • 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
  • Hand guard Type: PSA 9" M-Lok Lightweight Rail
  • Bolt Carrier Group Included: Yes
  • Bolt Steel: 9310, Nickel Boron
  • Bolt Carrier Profile: Full-Auto
  • Charging Handle included: Yes 

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 300AAC, with a 1/8 twist, M4 barrel extension, and a pistol-length gas system. This 10.5" heavy profile barrel is Mil-spec phosphate coated, High Pressure tested and Magnetic Particle inspected. The barrel is finished off with a 9" PSA 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.

 Bolt Carrier Group: 5.56mm Bolt Carrier Group is Nickel Boron coated and features a 9310 bolt.  The gas key is hardened and secured with Grade 8 fasteners, and is staked per Mil-Spec. 

Each upper is assembled to order with US-made parts, and test fired to check gas function. 

SKU: 5165448092
SKU 5165448092
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
SKU: 5165448092

Questions and Answers

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Browse 3 questions Browse 3 questions and 3 answers
What is the inside diameter of the hand guard?
Johnk on Apr 19, 2018
Does this upper fit PSA-AR15 complete classic lower 7244?
Freddy on Apr 17, 2018
BEST ANSWER: Yes, it will.
can the a2 flash hider be removed to place a linear compensator instead?
jonathan on Apr 23, 2018
BEST ANSWER: The muzzle extends beyond the hand guard, so any .30 caliber, 5/8x24 thread muzzle device should work.


4.7 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Custom 300AAC blackout
Great barrel, love this 300 blackout. Paired it with a PSA pistol kit for my lower and added a KAK flash can and a mag pull M lock AFG. Like this little AR pistol to sit under my back seat in my pickup. Fun little gun.
July 13, 2018
1 month ago
Few missteps but overall very positive!
Actually very decent accuracy for a 10” 300 blk upper. Was regularly ringing steel plates at 100 yards. Built with a palmetto lower parts kit and SB PDW brace on an Anderson lower. Got several light primer strikes and failures to go into battery during the first 100 rounds but this seemed to decrease as the range day progressed. Fired a total of 140 rounds. Majority of failures occurred in the first two magazines. I’m guessing this is the firearm breaking in and will update the review accordingly. So far so good. If the kinks work out it’ll be a fantastic little rig.
July 12, 2018
1 month ago
Quality workout breaking the bank
My 1st PSA build. If definitely won't be the last.
My 1st PSA build. Didnt break the bank. This won't be the last.
My 1st PSA build. Didnt break the bank. This won't be the last.
July 8, 2018
1 month ago
Excellent Product would definitely recommend to anyone looking at building a 300 pistol.
I would absolutely recommend this chf fn barreled 300 black out. It is my new favorite gun to shoot with a can. Sounds like a 22 short.
User submitted image
Added Jun 9, 2018
June 9, 2018
2 months ago
A solid build. Great for the price.
The charging handle is a bit stiff, will see if it breaks in with more use and lubrication. If not an easy swap.
Overall, very happy
May 21, 2018
3 months ago
Great FN barrel
This upper with the FN barrel (FN factory stamp on the barrel), is very accurate (tight group), and it works well with the pistol lower that I paired it with. This upper works well with all bullet weights, and has had Zero feeding issues. If you want to build a 300 blackout, This is a great barrel to use. FN also makes a chrome lined barrel in 5.56 MM and 7.62 MM, and I'll use a few of those for my other Palmetto builds.
May 18, 2018
3 months ago
Top Quality
I bought mine last year on sale with free shipping.
It has run flawlessly on a PSA lower.
I upgraded the lower to a PSA AR15 Complete MOE EPT SBA3 Lower - .
It looks as good as it functions.
PSA CHF Chrome Lined 300BO upper
PSA CHF Chrome Lined 300BO upper
May 5, 2018

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