PSA Gen3 PA10 20" Rifle-Length .308 WIN 1:10 Stainless Steel 15" Lightweight M-lok Upper - With BCG & CH

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PSA Gen3 PA10 20" Rifle-Length .308 WIN 1:10 Stainless Steel 15" Lightweight M-lok Upper - With BCG & CH


Quick Overview

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: 5165490770
UPC: 5165490770
MFR#: 5165490770


Barrel Length: 20"
Gas System: Rifle-Length
Barrel Profile: A2 Style
Barrel Steel: 416R Stainless Steel
Barrel Finish: Stainless Steel
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 308 WIN
Twist Rate: 1:10
Barrel Extension: M4-style
Diameter at Gas Block: .750
Gas Block Type: Low-profile 5 position click switch adjustable gas block
Gas Tube: Black Nitride Gas Tube
Muzzle Device: A2 Style Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: PA10
Handguard Type: PSA 15" M-Lok Free Float Rail with Anti-slip and anti-rotation features
Bolt Carrier Group Included: Yes, Toolcraft PA10 BCG with extra power extractor spring
Charging Handle Included: Yes, 7075 T6 CH Included

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You asked, we listened! Palmetto State Armory is proud to release our Gen3 PA10 Barreled Upper Receiver!  The Gen3 model has been enhanced to improve the reliability and longevity of our PA10 platform. This new platform includes several features that have never before been included on our PA-10 platform. We hope you enjoy these new features and look forward to your feedback!

With enhanced durability and improved function, the new and improved PSA PA10 Gen3 is here.  The Gen3 model offers a black nitride stainless gas tube to better resist high heat and corrosion while maintaining a glossy black finish.  All Gen3 PA10 models come with a dimpled barrel for ease of gas block replacement if you choose to do so. We have also included a newly designed click switch 5 position adjustable gas block so you can specifically tune to your load.

Gen 3 Benefits at a glance:

  • Dimpled 416R Stainless Steel Barrel
  • 5 Position Adjustable Click Switch Gas Block
  • Extra Power Extractor Springs
  • 7075 T6 Charging Handle Included in all uppers
  • Black Nitride Gas Tube
  • Barrel Nuts properly torqued to military specifications
  • Anti-slip and anti-rotation handguards


Barrel: The dimpled, 416R Stainless Steel, 308 WIN 1/10 twist, rifle-length gas system upper is paired with a Palmetto State Armory 15" M-Lok free-float rail, low profile adjustable click detent 5 position gas block, and an A2-style muzzle device. The gas system is enhanced with a nitrided gas tube in order to better resist high heat and corrosion.

Upper:  Precision machined from forged 7075-T6 aluminum, then Black anodize hard coated to MIL-8625 Type 3 class 2. With enhanced dual retention anti-slip and anti-rotating handguards.  

Bolt Carrier Group: Tool craft 9310 steel bolt assembly with extra strength extractor springs that is nitride for increased durability.  8620 carrier, nitride treated, with a nitride treated gas key properly staked with grade 8 fasteners.  A 7075 T6 aluminum charging handle is also included.

The Gen3 PA10 receivers are functionally compatible with the Gen1 and Gen2 upper receivers, however, we recommend matching Gen3 lowers to Gen3 uppers for best appearance and performance.  There are external cosmetic differences when mixing Gen1 with Gen2 and Gen3 upper and lower receivers that some may not find appealing.  

The AR10 platform does not enjoy a common design between manufacturers, like the AR15. As a result, there can and will be subtle differences in the parts kits of various manufacturers. Some parts, like the fire control group, are shared with the AR15 platform to preserve the options for upgrading. For best results, we recommend only using PSA PA10 parts with our uppers and lower receivers. We do not recommend using other manufacturers parts in our products.

SKU: 5165490770
SKU 5165490770
Department Uppers
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video llR0G_N5rlc
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165490770

Questions and Answers

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Browse 18 questions Browse 18 questions and 22 answers
What are the cosmetic differences when you use Gen 3 upper on Gen 2 lower? What should I keep in consideration when using gen 2 lower for gen 3 upper?
Neidoo on Aug 13, 2019
When will a Gen.3 nitride 20in. barrel be available?
Jeff J on Aug 16, 2019
BEST ANSWER: likely eventually
No instructions for gas port adjustment! Which way to turn for more or less gas?
I would think instructions would be included with this upper!?
Jeff J on Sep 24, 2019
BEST ANSWER: Clockwise closes gas port. Counter clockwise opens it. I start with gas port totally closed, bullet in the chamber, magazine empty, and fire. Open gas port one full turn, then repeat process until shell ejects and bolt locks back. You can fine tune from there. You will probably have to eject the first shell or two yourself!
I'm new to buying uppers and lowers. I usually buy complete rifles. I'm interested in the PSA GEN3 PA10 20" 308 upper and the PSA GEN3 PA10 2-stage lower. Will I need any additional parts besides these two items? I'm also looking at the PSA premium ambi PA10 charging handle. Is this a good choice for this combination? Thank you and stay safe.
John Mattingly on Oct 11, 2019
BEST ANSWER: If you buy the gen 3 upper and lower you will need to buy a magazine. I recommend Pmag. Charging handle will be good. PSA has been having some problems with the lower buffer configurations. You will need to check your heavy short buffer, spring and buffer tube length combinations. Some have received good combos, others have not, like me!
why do you guys keep on putting outdated a2 profile barrels on everything?
Ryan P on Aug 17, 2019
BEST ANSWER: Current machinery, current tooling, already trained, "who" (beside you) says A2 profile is 'outdated;?? And 'why' do you think the A2 profile is 'outdated?? A2 is a good, proven barrel, especially in SS due to heating cooling cycles and longevity. It is heavy but we are not talking about pencil .223's here....
Is this upper DPMS compatible unlike the gen1 & 2?
Jon P on Aug 12, 2019
Will this uppers work with any brand lower or PSA only ?
Jon M on Aug 12, 2019
BEST ANSWER: Stick with PSA, that way you can be sure it will function properly.
does this upper pair with an AERO M5 AR10 lower?
John S on Dec 12, 2019
BEST ANSWER: Mine did not, the PSA is PSA lower only. With mine the charging handle wouldn't pass the lower where the buffer tube is.
Is this barrel safe to shoot 7.62?
Brandon B on Dec 3, 2019
BEST ANSWER: I have yet to experience any problems with over 500 rounds of Military 7.62.
Will this work with a psa gen2 stripped lower?
John L on Nov 12, 2019
BEST ANSWER: I used it on my gen2 lower with out a problem. The gen3 lower has a few upgrades to make it more compatible with other devices. The function is not changed.
Yes it will work.
Will this upper work on am armalite ar 10 b series lower? There is so much grey area when it comes to armalite series a or b and not a lot of information about what is interchangeable.
ss_element on Jan 9, 2020
BEST ANSWER: Ar10 doesn't have a mil spec like ar15. I would recommend the same brand for upper and lower. I think it would work but I wouldn't chance it.
Is this mil specific?
Drew H on Nov 17, 2019
What's the best ammo out of the 1:10 twist? I'm starting into long range with this rifle and looking for a decent factory load to get decent groups till I start reloading my own
Jose G on Oct 21, 2019
BEST ANSWER: I've read that any ammo will run fine, if you want to go over 400 yards anything above 160 grains is your best bet.
When will PSA make this in a 24" model?
Trey B on Oct 11, 2019
BEST ANSWER: Only PSA can answer the question.
Will this work on a gen3 6.5 lower?
Charles on Sep 18, 2019

Yes, this will work on our Gen 3 PA-10 lowers.

Best Regards,
Palmetto State Armory Customer Service
Can this work with an LR-308 (DPMS gen 1 pattern) from 80% Patriot Pack?
Bryce L on Sep 15, 2019
Will this upper or any 308/762 or 6.5Creedmoor upper work with an Anderson lower receiver for a larger caliber?
bigmike on Sep 12, 2019
BEST ANSWER: "I" would check with BOTH PSA office and Anderson to be sure before I purchased....
charging handle compatibility ? which charging handle are the gen 3 compatible with? I tried the POF Tomhawk which worked fine with Gen 2 uppers but not with this Gen3 upper.
frank d on Jan 14, 2020


4.7 / 5.0
18 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great gun for the price.
User submitted image
Added Jan 18, 2020
January 19, 2020
3 months ago
Outstanding upper at this price range.
Paired with Palmetto Gen3 lower with EPT trigger, and M4-72 compensator. Getting 1.5”-2.0” groups consistently with off the shelf federal premium 168gr match ammunition.

Hefty, my assembled rifle is weighing in at 12.8lb with optic. You’ll live. Quit whining.
User submitted image
Added Jan 18, 2020
January 18, 2020
1 week ago
Ready and Waiting
Still awaiting weather break for field testing but all is assembled lubed and at ready for break in . Optics laser sighted installed should be real close after break in
AR10 Assembled laser bore sighted with Nikon Monarch scope
AR10 Assembled laser bore sighted with Nikon Monarch scope
December 29, 2019
2 months ago
Some difficulty matching to Gen 2 lower I had put together from spare parts. Having the correct buffer and spring is key. The upper is beautiful and shooting just under 1 MOA with cheap factory ammo.
December 26, 2019
2 months ago
Just amazing.
I absolutely love this upper. I paired it with a gen3 complete lower. The gun runs great, no cycling issues. I'm holding a .75 inch MOA at a 100 yards. I have put about 100 rounds through it so far. I will update this review if I have any issues as I continue to put rounds through it. This is my first purchase through Palmetto, and I can say I believe they will be getting a lot of my money.
December 24, 2019
1 month ago
Well built and very accurate....excellent upper!
December 18, 2019
3 months ago
It's a work of art. Fit and finish are impeccable. I've only order a few guns from PSA and so far they have been perfect. While you are on the site, check out the KS-47. It's well worth the look.
Word of caution - the Hexmags do not work in my Gen 3 PA-10. The bolt release will not send the BCG home.
December 11, 2019
Quality control needs to be improved
The upper feels solid, fit is great with gen 3 lower but they shipped it to me with a small dent on the finished side as if it was bumped into a sharp metal edge. Its not enought to make me ship it back but should have been sold at blem sale not full price..
December 10, 2019
1 month ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service with your order number so we may resolve this issue.
December 23, 2019
Casey S Staff
Fit, finish and function at a price you can afford.
November 29, 2019
2 months ago
Get one
Great gun, I got a lower also. I just needed to adjust the gas bock and put a lighter trigger springs on it. Now it’s shooting MOA groups and cycling perfectly
November 4, 2019
3 months ago

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