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PSA 7.5" Phosphate 300AAC Blackout 1/8 6" Lightweight M-Lok Upper - With BCG and CH - 5165447573

In stock

Regular Price: $ 379.99

Special Price $ 249.99

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.

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: 5165447573
UPC: 5165447573
MFR#: 5165447573

Barrel Length: 7.5"
Gas System: Pistol Length
Barrel Profile: Heavy
Barrel Steel: 4150V 
Barrel Finish: Phosphate
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 300AAC Blackout
Twist Rate: 1:8
Barrel Extension: M4
Diameter at Gas Block: .750
Gas Block Type: Low-Profile
Muzzle Device: A2 Style Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: PSA 6" Lightweight M-Lok Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: Carpenter 158
Bolt Carrier Profile: Full-Auto
Charging Handle Included: Yes
Overall Length: 17"

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Barrel: 7.5" Chambered in 300AAC Blackout, with a 1:8 twist rate, M4 barrel extension, and a pistol length gas system.  This phosphate barrel is finished off with a PSA 6" Lightweight M-Lok free-float rail, .750" diameter low profile gas block, 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.

Bolt: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is parkerized outside, and chrome lined inside.

SKU: 5165447573
SKU 5165447573
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: 5165447573

Questions and Answers

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Browse 6 questions Browse 6 questions and 23 answers
Why did PSA. remove my negative review of this product?
NoNoMoor on Jun 21, 2018
BEST ANSWER: Did you try to work with them on your issue? They have always been responsive to me and others.
Has anyone run this suppressed and had any issues running it suppressed with subsonic ammo?
Ted H on Jun 21, 2018
BEST ANSWER: I run it with an AAC 762 SD, I haven't had any issues with subsonics or supersonics with or without the can. Probably put about 100 rounds of 220 grain subs and maybe 40 rounds of 147 grain supers, no issues suppressed or unsuppressed.
Can you use the normal ar15 lower or does it have to be the pistol lower?
YaBoiCOMMON Y on Sep 3, 2018
BEST ANSWER: Normal ar15 lower will work, but you can't put a buttstock on it without ATF paperwork. Youll have to buy a pistol brace for it.
Is this a complete upper? Do I just need a complete lower to finish the build?
Patti on Oct 15, 2018
BEST ANSWER: Yes - it included the BCG and charging handle - I simply put it on a lower pistol kit and it fires great. Easiest build ever.
Does a pistol lower with a standard carbine buffer work with 300 blkout or do I have to buy a different pistol lower to use with this upper?
James Z on Jul 10, 2018
BEST ANSWER: I had issues cycling subsonic (hornady black) with the standard spring. Got a softer spring, works awesome. Sig subsonic and "normal" rounds worked well with standard spring. So yes, your lower should work out fine. But you may need a softer spring for some ammo to cycle reliably.
Will you ship this upper to California?
David M on Jun 25, 2018


4.8 / 5.0
31 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
The upper fits and functions perfectly! I would recommend it. It even cycles perfectly with subsonic ammo!
June 19, 2019
2 months ago
Very nice at good price
Was nice upper with good workmanship. Looks like a little pride was put into it!!
December 5, 2018
8 months ago
Get one!
I love it! You should definitely get one! I will be getting more!
User submitted image
Added Nov 21, 2018
November 21, 2018
8 months ago
Suppressor Ready
In my opinion, this 7.5" .300 BLK upper is the quietist a suppressed weapon can be.
November 6, 2018
8 months ago
Best little hog killer available with a THOR 4 atop it!
Great look accurate to 250 yards with iron sights. Accurate to 509 yards scoped
Just turn it around and you’ll get the picture
Best lil hog killer available!
November 2, 2018
8 months ago
Extremely Pleased
There is nothing I do not like about this upper or the deal from PSA. I used it to finish a pistol build to carry as my "truck gun". I've not tried any bullets lighter than 125 grains, as all my other 300 BLK barrels seems to prefer 125-130 grain bullets for accuracy, and this one seems to fit that same mold. I do not hesitate to recommend this upper to anyone looking for something in this category.
November 2, 2018
9 months ago
Pistol build.
Pistol build.
I haven’t run many rounds through yet, but so far fires every time. I have tested a few different loads and the only issue is it doesn’t lock back the bolt with 220 grain subsonics. Locks back just fine with higher velocity rounds. I will see how it does on the next range trip. I am very happy with the price and build quality.
October 20, 2018
9 months ago
Perfect, great price
7.5" barrel with 6" M-Lok was the perfect size for me. Once you add the suppressor the length is still very manageable for all applications: indoors, around corners, defense. The upper slipped easily into my Springfield lower that I had, converting my .223 into a 300 BO in less than 30 seconds. Every round functioned flawlessly, either supersonic or subsonic; just take the flash suppressor off install your sound suppressor and you're off. I have a Silencerco Omega and it works great. Pressure to cycle the action did not need to be adjusted; over 500 rounds through so far.
October 18, 2018
9 months ago
Great 300 upper. I will not hesitate to buy other uppers.
Fantastic piece of gun, I was pleasantly surprised by the overall quality and the fit and finish. Accurate shooter great fit with several lowers.
User submitted image
User submitted image
October 13, 2018
9 months ago
Palmetto 300 B/O pistol upper
Excellent product and priced well as usual from an excellent company. PSA is the greatest !
October 11, 2018
9 months ago

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