PSA 20" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" M-Lok Upper With BCG & CH

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PSA 20" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" 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: 5165449156
UPC: 5165449156
MFR#: 5165448709

Barrel Length: 20"
Gas System: Rifle-length
Barrel Profile: A2 Style
Barrel Steel: 416R
Barrel Finish: Stainless Steel
Chrome Lining: None
Muzzle Thread: 5/8-24
Chamber: 6.5 Grendel; Type 2
Twist Rate: 1:8
Barrel Extension: M4
Diameter at Gas Block: .750
Gas Block Type: Low profile adjustable gas block
Muzzle Device: A2 Flash Hider
Receiver Material: Forged 7075 T6
Receiver Type: M4
Handguard Type: PSA 15" Lightweight M-Lok Free Float Rail
Bolt Carrier Group Included: Yes
Bolt Steel: 9310, Nitride Coated
Bolt Carrier Profile: Full-auto
Charging Handle Included: Yes
Overall Length: 26.5"
Weight as Configured: 4.5lbs

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Barrel: 416R Stainless steel. Chambered in 6.5 Grendel, with a 1:8 twist, M4 barrel extension, and a rifle-length gas system. Barrel is finished off with a PSA 15" Lightweight M-Lok free float rail, .750 adjustable gas block, and A2 flash hider.

Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. These uppers are made for us right here in the USA by a mil-spec manufacturer.

Bolt: Full-auto profile bolt carrier group. 9310 steel bolt, Shot Peened, Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. 8620 steel M-16 profile carrier is nitride treated.

SKU: 5165449156
SKU 5165449156
Department Uppers
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Unit Price N/A
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165449156

Questions and Answers

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Browse 22 questions Browse 22 questions and 101 answers
Does this barrel have 5R rifling?
Henry M on Aug 19, 2018
BEST ANSWER: No, it has standard profile rifling. But it shoots great. Down to 0.5 MOA with a little time perfecting handloads, and sub-MOA with good ammunition (not bulk ammo).
what barrel blank is used and who finished its machine work and chambering?
Larry G on Sep 19, 2018
BEST ANSWER: PSA hasn't answered this question for me either. All I can tell you is that I have not seen a headspace issue in the 20 or so PSA-branded barrels in various calibers, and all of them shoot 1-MOA or better with good ammunition. AR-15 and PA-10 frames. If they aren't making these barrels in-house, whoever is making them for PSA knows what they are doing. They are quality barrels.
Why do the people answering the questions get upset? Is there something on your sight that prevents data entry mistakes? If you want to have people answer questions that’s fine but they shouldn’t be giving anyone a hard time.
Matthew M on Aug 17, 2018
Which lower do I need to complete this build?
SharpKnife on Aug 14, 2018
BEST ANSWER: Any Ar15 lower would be fine. You'll just need the correct magazine to insure proper function.
Grendel or Creedmor. What's the difference?
Joseph on Sep 2, 2018
BEST ANSWER: Google and YouTube can answer that for you better than I can. All I can do here is type, so the answer will get a bit wordy and boring. Both cartridges use 6.5mm (0.264") diameter projectiles. Long story short, the 6.5 Creedmoor will shoot the same projectile about 500 feet per second faster than the 6.5 Grendel. And 6.5 Creedmoor is too big to work in an AR-15 sized rifle. Details are given below, but look at YouTube. Videos are better than words.

The 6.5 Grendel (based on the 220 Russian cartridge, a grandson of 7.62x39) will work on both the AR-15 and AR-10/LFAR/PA-10 platforms. The AR-15 platform is shorter, smaller, and generally cheaper to get into than AR-10/LFAR/PA-10 platform rifles so most 6.5 Grendels will be built on AR-15 platforms. The 6.5 Creedmoor (based on the 30TC cartridge - the 260 Remington is based on the 308/7.62x51 cartridge) will only work on the AR-10/LFAR/PA-10 platforms. This is because the Creedmoor case is longer so it can hold more gun powder. The magazine well of an AR-15 is just too short for a 6.5 Creedmoor cartridge. But they fit just fine in the larger mag well of an AR-10/LFAR/PA-10 lower receiver.
What's the difference between this upper,and the other 6.5 Grendel upper #8709?
Charles J on Nov 10, 2018
BEST ANSWER: Through my research I could not find a difference between SKU# XXXXXX9156 and the SKU# XXXXXX8709 other than the handguard is of a different design. My decision was based on two factors.
1. I prefer the more skeletonized design without the continuous Pictiny rail on top.
2. At the time of my purchase the one ending in 9156 was at a lower price.
PSA 20
PSA 20" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" Lightweight M-Lok Upper - With BCG & CH - 5165448709
PSA 20
PSA 20" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" M-Lok Upper With BCG & CH
Will this fit a ruger 556 lower?
Adam W on Jan 31, 2019
BEST ANSWER: If your lower is made to the standard specifications of all other AR type lowers, which I would think it is, You should have no problem. You will need a different clip.
Is this a type 1 or type 2 6.5 Grendel bolt/barrel combination?
Zach S on Aug 16, 2018
BEST ANSWER: Chamber description above says type 2.
Is the bolt different from an AR 15 bolt and bolt carrier? And I have a regular PSA lower this upper is all i need to shoo 6.5 grendel?
Manuel L on Aug 16, 2018
BEST ANSWER: Yes, the bolt face is the same as the Russian 7.62x39 - not the 5.56 or .223. This upper with its bolt carrier group is all you need, if you have an AR15 lower. Also, you can't just interchange bolts even between same caliber AR15's . For safety they should be head space checked before use.
Do you have a picatinny rail that can be added to this handguard to add a bipod?
Trace M on Feb 3, 2019
BEST ANSWER: Magpul also produces an M-LOK bipod, P/N MAG933 (available in black and FDE), which connects directly to M-LOK rails without needing a Pic rail insert.
Does this come with a matching bolt?
Kyle A on Aug 15, 2018
BEST ANSWER: From the description:
Bolt Carrier Group Included: Yes
so i cant put a 6.5 creedmoore in this barrel?
beandip on Mar 5, 2019
BEST ANSWER: No!! The Grendel is based on a 7.62x39 case, the Creedmore is based on the .308WIN case.

The Grendel is an AR15 based gun and Creedmore is an AR10. If your looking for a Creedmore upper, lpk at the PA65.
I have a dpms Oracle chambered in 5.56. Will this upper fit on the lower i already have?
Chris on Nov 7, 2018
BEST ANSWER: This upper will install on any standard AR-15 lower. You will want to purchase different magazines to work with the new caliber though. Mine fit perfectly on a 5.56 lower.
this a heavy barrel?
Brian g on Dec 9, 2018
BEST ANSWER: No. Its an A2 profile which is heavier than necessary from the gas port to the muzzle. It isn’t a heavy bull barrel though. I think the upper weighed 4lb 8oz.
So first off does this upper shoot the 762.39 round or just 6.5....and does this HV a muzzle brake installed????
STEVE on Mar 15, 2019
BEST ANSWER: It shoots 6.5 Grendel. You can form 7.62x39 brass into 6.5 grendel but it will not shoot .311 diameter bullets. It has a flash hider not a muzxle break so any muzzle break threaded for 5/8-24 with a bore diameter for a .264 bullet will work.
Does it come with the barrel nut wrench to swap handguards?
geoffrey n on Nov 16, 2018
BEST ANSWER: Like all other upper receivers that don't expressly list it, no
What is the difference between this upper,and the other 6.5 Grendel upper #8709?
Charles J on Nov 10, 2018
BEST ANSWER: one has full length rail one does not.
What magizine should you use with this caliber ?
Jay Smith on Aug 19, 2018
BEST ANSWER: I second the E Lander. No issues at all. I have the 17 round mags.
Does PSA have a accuracy guarantee? 1moa or better?
Nathan S on Mar 28, 2019
Does PSA have an accuracy guarantee on this upper 1MOA?
Nathan S on Mar 27, 2019
Can this upper and magazine be shipped directly to my home?
Roger M on Mar 17, 2019
I understand that these bolts are type 2 per description, but are they designed for .136 headspacing? What is the manufacturing tolerance?
DP786010 on Mar 11, 2019
BEST ANSWER: This is an official SAMMI cartridge. The spec says head space 1.2201 min and 1.2301 max. If you want to verify your head space you need to purchase a head space gauge for the 6.5 Grendel.


4.4 / 5.0
69 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Accurate, well built, great value, with minor caveats
First time shooting this upper today, 0.8 inch 5 shots group at 100 yards is not bad for this budget upper. Since I used hunting bullets and did not really develop this load I am pretty sure it can give better accuracy with better bullet and some development. It is also quite light, so you can use it for hunting with no problem.

One issue I have is this upper is under-gased, a lot. The bolt would not catch the next cartridge , nor the magazine follower. This is due to the installed adjustable gas block is set to very low gas when assembled. A few turns of a hex key fixes it but it was troubling at first.

I also wish they have a heavy barrel version of 20" grendel upper. This one has a fairly light barrel, good for hunting, not so much for target.
100 yards, 0.8 inch. 110Gr Controlled Chaos, 26Gr 8208, CCI450, Starline Brass.
100 yards, 0.8 inch. 110Gr Controlled Chaos, 26Gr 8208, CCI450, Starline Brass.
August 4, 2019
5 months ago
Good upper very accurate
July 28, 2019
5 months ago
PSA Great, Product a little lacking
On receipt, the upper appeared to be high quality and just what I wanted. Unfortunately, upon close inspection, the finish on the hand guard was marred and the lugs were badly scarred. The piece appeared used or mishandled in test firing. I requested and was granted, very graciously, a prepaid return. The replacement was on back order, as was a comparable upper. PSA then offered a refund. On the whole, PSA has been very professional and supportive in this transaction, which just did not go well for them. I appreciate their most pleasant cooperation. We will continue to do business.
June 24, 2019
3 months ago
6.5 Grendel upper
I have had problems ,as others have, with cycling rounds and bolt locking back on the last round in the magazine. I have tried different ammo and magazines and adjusting the gas block. Nothing has worked. I talked to customer service and returned the upper for repair.
June 16, 2019
6.5 grendel upper
Fast delivery, excellent assembly. Fitted my lower easily. I would recommend this 6.5 to anyone looking for a well built rifle of that caliber.
June 3, 2019
4 months ago
Won’t cycle rounds or lock back on an empty mag. Brand new rifle and it has problems out of the box. Unbelievable.
May 23, 2019
5 months ago
Response from Palmetto State Armory
We do apologize for that. Please contact Customer Service so we may resolve this issue.
May 24, 2019
Casey S
If your into reloading this is the caliber for you
After break in it consistantly shoots sub moa groups at 100
100yrd group with this 20inch palmetto state armory barrel, 130grn eld matches 24grns of 8208
PSA upper, ruger elite lower, magpul hardware, vortex optics, equals deadly precision
May 19, 2019
5 months ago
Wonderful at any price
I purchased a 20inch grendel upper from PSA. The quality is fine but the accuracy is exceptional. I have sense that time bought a 300BLK with the same results. Both are very accurate for the range so I am sure for hunting there would be no issues at all. The function has been flawless for both uppers. I would not hesitate to buy another in the future.
May 11, 2019
5 months ago
Very nice - so far!
These have been out of stock for quite a while...I got lucky and found one in the Summerville, SC store!!!

Mated up perfectly to my PSA lower that has a Geissle 2-stage trigger. The new style handgaurd that Palmetto is selling is much nicer than the old style ones...more comfy for the hands, and the anti-rotation pins are a very welcome addition.

Put a Primary Arms 4-14 ACSS DMR and shot from bipod/sandbag. Did break in using a mix of Wolf (20 rounds) and Hornady Black ammo (20 rounds.) After about 100 rounds through the upper, able to shoot 2 inch groups with Wolf ammo and almost 1 inch groups with Hornady Black. This was all done at 100 yards.

I have no doubts that this will tighten up the more I shoot.
May 7, 2019
Good enough!
Overall it's a good upper. Issues were the bcg finish is a little rough and the dust cover finish is pretty cheap as well. Also had some zeroing issues but that may have been the ammo I was using.
User submitted image
Added May 7, 2019
May 7, 2019
5 months ago

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