18" AR with M-Lok rail Complete Kit

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PSA 18" Rifle-Length 6.5 Grendel 1/8 Stainless Steel 15" Lightweight M-Lok MOE 2-Stage Precision Rifle Kit - 5165450139

In stock

Regular Price: $ 749.99

Special Price $ 449.99

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 www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).

SKU: 5165450139
UPC: 5165450139
MFR#: 5165450139
  • Barrel Length: 18"
  • 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
  • Build Kit: PSA MOE 2-Stage Lower Build Kit, Black
  • Overall Length: 24.5"
  • Weight as Configured: 4.2lbs

Add To:

Barrel: 416R Stainless steel. Chambered in 6.5 Grendel, with a 1:8 twist, M4 barrel extension, and a rifle-length gas system. The 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.

Build Kit: PSA MOE 2-Stage Lower Build Kit

SKU: 5165450139
SKU 5165450139
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: 5165450139

Questions and Answers

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Browse 8 questions Browse 8 questions and 18 answers
What type of two-stage trigger is this? I have been putting Geissele SSA-E's in most of my builds.
Geoff A on Dec 10, 2018
BEST ANSWER: The one pictured in the image above is from stag arms.
Is the buffer tube mil-spec or commercial spec?
Dave M on Dec 11, 2018
BEST ANSWER: It appears to be Mil-spec if it was commercial it wouldn't be completely flat it would have a slight angle at the end of the buffer tube
Any difference with item #5165 450 280?
Jiangzhi C on Dec 24, 2018
BEST ANSWER: Only difference seems to be the handguard design, if you compare the parts they're the same parts. Compare the pictures and you'll see the handguards are different
Which lower receiver can I use ??
TRUC T on Nov 28, 2018
BEST ANSWER: Any mil-spec AR-15 Multi-Cal stripped lower will work with this upper. You will need 6.5 Grendel Magazines as well.
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Can I run the 6.5 upper on my 5.56/.300 Blackout Lower?
Lawrence W on Mar 26, 2019
BEST ANSWER: Not a ar 15 expert but uppers and lowers for ar15 are interchangeable. There are several calibers available. 6.5 grendal takes a different follower or a deadicated magazine, only holds 27 or 28 rounds. 6.5 credmore is to long for ar15 travel, takes ar10 rifle
So I'm taking it that this kit has a "2stage" trigger included in it?
Bubba on Dec 27, 2018
BEST ANSWER: Did you read the item description?
24" barrel available ?
Magic Mije on Dec 26, 2018
BEST ANSWER: That's a question for Palmetto State not the question board
It sais that the bolt carrier group is full auto does that mean the rifle would be fully automatic?
Chris P on Nov 28, 2018
BEST ANSWER: No, it just means that the BCG is a full-auto profile, the same as used in mil-spec weapons.


4.7 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
6.5 Grendel
Bought 3 kits, great quality, shoots moa. Recommend to use Grendel mags.
June 7, 2019
3 months ago
Great - if you get one that works
Let me begin by saying that I really like this rifle. If you get one that works, you're in for a treat. However, mine has been nothing but a PITA.

I first bought this rifle and fired it in December of 2018. The first few shots were great. After a few rounds the bolt wouldn't fully cycle, and a round would fail to feed into the chamber. After a few more, the bolt would not even cycle far enough to eject the rounds.

I sent the rifle back to PSA and heard nothing for 3 weeks. In mid January I hear a knock at my door and the rifle is delivered back to me with no documentation, no reports of anything that was done to the rifle, nothing. Just a rifle in a cardboard box. After inspecting the rifle, save for some greasy fingerprints on the barrel, there is no evidence that anyone made any changes at all. Regardless I headed to the range to try out my "repaired rifle".

When I fired the repaired rifle, it was the same story. First 3-4 rounds were great, next 3-4 failed to feed, final 3-4 failed to eject. Very disappointed to say the least.

I'll be returning this to PSA once more with explicit directions to fire the rifle multiple times before returning it to me. After that I'll probably take it to a proper gunsmith and see what can be done for it.

Moral of the story: it is a great rifle, as long as it works.
May 30, 2019
7 months ago
Great value for the money
If you're looking to dip your toes into 6.5 Grendel this is the perfect low cost starter Grendel upper.

Barrel - 1MOA accurate with Hornady 123G ELD-M and SST.
BCG - Very nice nitride finish, cleaning is super easy and smoothness helps with cycling action.
2-Stage trigger - Surprisingly very nice, very crisp trigger. Geissele trigger is better of course, but I definitely don't feel the need to upgrade this one.

Upper Receiver & Handguard - there is some fitment issues with the one I got. The Gas block rests on the handguard so the barrel is technically not free-floated, but still shot 1MOA. It also definitely not onpar with more expensive handguards (obvious I know) out there. The 1913 rail and mlok rails' edges feel very sharp, not nice in the hand. and the alignment of the handguard to the receiver has some play. I'll be replacing handguard.
Gas Block - while it is adjustable, my adjustment screw broken the first time I went to adjust it. Maybe I'm an oaf who was too rough on it, but just a warning that it might be quite fragile.

All in all, I'm pretty happy, its a blast hitting steel at 800-900 yards, and the upper has a nice base for you to build/upgrade on top of it at your own pace. Just good luck trying to find the upper when its in stock.
PSA 6.5 grendel 18" upper at the range
Group shot at 100 yards with Hornady 123 ELD-M. Those squares on the paper are smaller than an inch.
April 24, 2019
6 months ago
6.5 Grendel
I was very satisfied with the 6.5 Grendel build kit I would recommend this kit to a friend.
February 24, 2019
6 months ago
6.5 grendel.
I love it seems to be working very nice. Ammo landing in the same spot over and over and over. Took about 30 rounds to break in. Next I’m going with a 24 inch thank you.
February 22, 2019
6 months ago
I love this rifle. Best for the money there is.
Great rifle has no problems except feeding ones and I think those are just grendel specific because they are so aggressively necked. Getting about 1 MOA at 100 yards with match ammo, sometimes it gets lower. Can’t reccomed it enough such value for money.
February 10, 2019
7 months ago
Love the trigger
Great price. Great trigger. Great accuracy. PSA orders have been spot on.
January 31, 2019
7 months ago
Didn’t want to buy ar style rifle but glad I bought this one.
Had trouble with accuracy at first till I cleaned out the barrel couple of times, shots good now. Two stage trigger, adjustable gas, great buy, will be buying more from Palmetto state armory.
January 24, 2019
7 months ago
Great kit very pleased with purchase
Sweet kit very well put together couldn't beat the price for what's included didn't use trigger though put single stage 4.5 in love the set up
January 20, 2019

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