PSA 5.56 Premium Full Auto Bolt Carrier Group

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PSA 5.56 Premium Full Auto Bolt Carrier Group with Logo - 8779

In stock

Special Price $ 69.99

Regular Price: $ 89.99

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: 8779
UPC: 8779
MFR#: TCFA-011556HPT



  • Milspec Carpenter No. 158® steel bolt
  • Shot Peened Bolt
  • High pressure tested
  • Mag particle inspected
  • Chrome Lined Carrier (AUTO)
  • Chrome Lined Gas Key
  • Gas Key Hardened to USGI Specifications
  • Gas Key Grade 8 Hardened Fasteners
  • Gas Key Staked Per Mil-Spec
  • Tool Steel Extractor
  • Extractor Spring
  • Extractor O-ring Insert
  • SKU 8779

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Made in USA.  Bolt is made of Mil-spec Carpenter 158 steel, Shot peened, High pressure tested and Mag Particle Inspected.   Gas key is machined out of bar stock, chrome lined phosphate coated, and secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is phosphated outside and chrome lined inside.  Laser engraved with the PSA logo.

For packaging considerations, BCG will be packed dry.  As a result, it will have a grey, dusty appearance that will turn  black with the application of CLP or other preferred lubricant.

  • Extractor Spring
  • Black Extractor Insert
  • Mil-Spec O-Ring
SKU: 8779
SKU 8779
Department AR Parts
Brand Palmetto State Armory
Daily Deal No
Daily Deal Expires No
Unit Price No
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 8779

Questions and Answers

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Browse 71 questions Browse 71 questions and 370 answers
what does this part do? is it the part that folds up?
nite f on Jan 4, 2019
BEST ANSWER: It is the shoulder thing that goes up
If Kavanaugh gets confirmed and I combine this with a 40 or 60 round magazine, will I cause a rift in the space-time continuum?
BillyBadassBgRg on Sep 11, 2018
BEST ANSWER: Yes, but the rift will only occur if you use a 1:7 twist barrel and premium ammunition that exceeds 3000 fps at the muzzle. I may have to recommend at least an 18 inch barrel to ensure velocities that will disrupt the time-space continuum under stated conditions given this formula: f ′ = 2 π ℏ ( E ′ 1 − E ′ 0 ) = f ( 1 − G M R c 2 )
Will this bolt turn my ar into a full auto gun? Or what else would I need to make that happen. New to this and was just curious thanks!
Mckay B on Apr 13, 2018
BEST ANSWER: absolutly. ALSO, I understand that taking out your buffer spring will help your bolt carrier move much faster back and forth. It would also help prove you shouldnt own a gun faster.
Will it make my M4 automatic?
Little Joey on May 27, 2018
BEST ANSWER: Only if you have the shoulder thing that goes up. Also, it may require you to make pew noises to jump start ot.
Looking to replace factory tiger ar556 bcg with a full auto bcg for reliability and fast firing. Will it work?
James H on Apr 14, 2018
BEST ANSWER: Where do you guys come from? Just funny to read some of the questions. You got no business with a MSR.
will this also work with .223 wylde?
edge1916 on Apr 16, 2018
BEST ANSWER: .223 wylde, is a description of a chamber profile...It is not a caliber of ammo....This BCG, will work with.. .223...5.56mm, and .300 blackout ....You do have to have a different barrel, for the .300 blackout.....all the other AR-15 parts will work with all 3....
I'm very new to this but could you tell me if that includes a firing pin?
Michael K. on Jun 5, 2018
BEST ANSWER: Yes, this assembly includes the Firing Pin, the Firing Pin Retaining Pin, the Bolt and the Bolt Cam Pin.
Does each part in this Premium BCG meet or exceed mil. spec.?
jay G on Jun 7, 2018
BEST ANSWER: Much better than "mil. spec. I have bought @5 of these...They are great....
Can I get this without the logo?
DeanM on Nov 1, 2018
BEST ANSWER: Yes, The part number is 39339.
Will this work the same for 300 blackout as well as 556?
Madison B on May 13, 2018
BEST ANSWER: Yes, a 5.56 BCG will work in a .300 (Obviously, use a .300 barrel.) The rest of the AR can use standard 5.56/AR parts. Check out this article on alternative AR calibers:
Check out Pew Pew Tactical's read on "Best Alternative AR-15 Cartridges and Calibers"
Who makes these carriers and bolts? Thanks
Mandrin on Aug 21, 2018
BEST ANSWER: The largely subjective, but widely accepted answer is Toolcraft. PS has brought a lot of companies in to the fold over the last few years. As they are not publicly owned, there is no way to know for sure. That being said, I absolutely do not believe PSA would try and and claim that a bolt was HPT/MPI when they sell so many that aren't. Point being, who makes it is irrelevant so long as it's a quality product.
How does this differ from a standard bolt carrier?
Gavin E on Oct 22, 2018
BEST ANSWER: If by standard bolt carrier you mean a civilian semi auto ar15/m4, then the difference is that the back shoulder of the bolt on MOST semi autos has been neutered to where the bolt will not hit the secondary sear that is required for a fully auto to cycle properly and function correctly.
Question Would a fotech echo 2 trigger work with my current bolt carrier or do I need buy this auto bolt carrier?
Mitchell B on Sep 19, 2018
BEST ANSWER: This totally depends on which echo trigger you have, the early version required a special bcg that was notched and the new one just requires a plain fa bcg.
Is the carrier itself 8620??
Manuel P on Apr 26, 2019
my only question is, does Don Lemon know about this part that turns a evil rifle into a fully auto satin stick??
Jedediah H on Apr 14, 2019
BEST ANSWER: Don lemon has no knowledge about anything best I can tell
Can this replace just a normal semi auto bolt carrier. I'm getting deep sc
ratches on my round when my carrier slides over the shell in the mag ?
Mike B on Oct 10, 2018
BEST ANSWER: Yes this can replace a "normal semi auto bolt carrier," although I suspect that if you're scratching your brass it may be due to.something else. I recommend you check your mag and mag release to ensure they aren't the issue before you replace the BCG.
Are these checked for correct headspace ?
Raymond B on Sep 27, 2018
BEST ANSWER: Head Spacing is specific to your barrel and the bolt. You will need to check it with your barrel receiver. Most if not all New Barrels and New Bolts will be fine.
Will it work with a semi auto?
Marty on Nov 17, 2018
BEST ANSWER: Absolutely. Being a full auto bcg means it is designed to be strong enough and capable of being used in a fully automatic version also. I've used two of these in separate builds. And, they function flawlessly.
Will this work in an ar15 pistol?
Cody P on Aug 21, 2018
BEST ANSWER: It should work in any standard ar pistol, carbine, and rifle
Will this BCG or a nickel boron bcg work with 7.62 x 39?
Ronald P on Nov 26, 2018
BEST ANSWER: No,this BCG has a Bolt for the 5.56/.223 cartridge. You need a BCG with a bolt for the 7.62 x 39 mm cartridge.
Will this work on a S&W AR15?
jonny on Oct 14, 2018
BEST ANSWER: yes,as long you’re using it for a 5.56 , 223 or 300 blackout ,mine has been working great
Is the bcg work on semi automatic 5.56 ?
Gerry on Sep 26, 2018
BEST ANSWER: Yes. This bcg works for the semi auto 5.56. It works very good.
Is this better or as good as the Nic. Bor. BCG?
Titt. on Oct 15, 2018
BEST ANSWER: the C158 NiB version is easier to clean after use but feature wise, they are nearly identical.
fwiw: PSA offers 3 different NiB bcgs.
Will this work with part number
Nate L on Dec 7, 2018
BEST ANSWER: Yes it will work perfectly fine. I have 3 of these BCGs and have had no problems with them. They have held up exceptionaly well and have been 100% reliable.
Does having a sense of humor required for your job position,or does it just help?
Chris S on Nov 25, 2018
BEST ANSWER: It's required, definitely. In job interviews, I always ask potential employers to give me their three best jokes. If I don't laugh, they don't get the job.
I also expect at least one genuinely funny prank per month.
Who makes this BCG, Toolcraft or A.O. Precision ?
Mark S on Apr 10, 2019
BEST ANSWER: It don't matter, they are both good companies
Do I need to buy a firing pin for this ?
Brian on Nov 21, 2018
BEST ANSWER: I bought this same bcg this unit is complete you do not need firing pin already has installed. I've put this unit through he'll and back extremely happy hope this helps.
will the bcg work for a 7.62x39 ?
Andrean D on Dec 1, 2018
BEST ANSWER: No, you will have to purchase one that is for that caliber.
Will this BCG work with my AR chambered in 7.62x39?
Michael G on Nov 19, 2018
BEST ANSWER: No it will not case diameter is different
Will this work for ar 15 pistol?
Nick S on Oct 1, 2019
BEST ANSWER: Yes, I run these in many AR Pistol builds, 7.5 inch and 10.5 inch and 11.5 inch. all function great with this bolt and carrier. Paul G.


4.7 / 5.0
959 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Exactly what is says it is accurate description
Great quality at a great price
November 17, 2019
2 months ago
PSA 5.56 premium full auto bolt carrier group
Excellent quality at an affordable price
November 16, 2019
1 month ago
Good quality
Tool craft quality bcg, highly recommended.
November 16, 2019
2 months ago
does what is supposed to do
other than the broken firing pin retainer. this would be a 5 star. nit-picky? probably, but this is the 1st time I broke the firing pin retainer out of 10 thousands of round on multiple BCG.
November 15, 2019
1 year ago
Bolt broke after 1000 rounds must have been a bad batch
November 11, 2019
2 months ago
Excellent BCG
Have high end nickel boron BCGs. At least for the first 1000 rounds without cleaning I have noticed no difference.
November 9, 2019
1 month ago
Slip sliding away
My subsonic only 300 blackout is gassed way down
with an adjustable gas block. This BCG keeps doing its thing
The other couple I tried were hanging up every 10 rounds.

I haven't done extensive testing so I should hold off on flapping
my gums on this. But the part of the BCG I can see through the
dust cover is looking very low carbon build up.
November 8, 2019
1 month ago
Nuff said.
What's to dislike, the price was right, the product functions perfectly and the shipping was fast. Yes, I would recommend this product to anyone.
November 3, 2019
2 months ago
It's an AR15 Bolt
For the price you can't go wrong. Functions perfectly. Quality is better than mil spec. Never a problem with any of my purchases from PSA. I stop here first and rarely look any further now that I know their stuff.
October 29, 2019
over 2 years ago
The rifle was constantly jamming and felt rough. Now that I got this BCG it's smooth and no more jams. I am very happy with the price and quality.
October 19, 2019
2 months ago