Description

This bolt carrier is manufactured from case hardened 8620 steel with properly staked 4130 steel gas key. The accompanying bolt is case hardened 9310 steel, shot peened, HPT and MPI tested, and finished in a self-lubricating polished black nitride. Bolt lugs are CNC ground following heat treatment to insure the greatest accuracy possible.

Material: Case Hardened 8620 Steel
Finish: Black Nitride. This advanced low friction coating minimizes the need for lubricants.
Gas Key: 4130 Steel attached with Grade 8 hardware and properly staked into a milled “valley” to ensure proper positioning.
Cam Pin: Hardened 4340 cam pin
Firing Pin: Mil Spec firing pin made of 8740 steel, center-less ground and Hard Chrome coated

Bolt Assembly: The Bolt is “true” Mil Spec dimension and external surfaces are CNC ground after heat treat for a precision fit.

Material: Case Hardened 9310 Steel. Carpenter 158 is available for an additional charge.
Finish: All Bolt components Shot Peened and Manganese Phosphate or Black Nitride
Extractor: 4340 Steel , Manganese Phosphate coated o Mil Spec Extractor Spring & O-Ring Combination
MPI: Magnetic Particle Inspected
HPT: High Pressure Test

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Additional Information

Dropship:	No
Platform:	AM-15
Original Store:	ACME Machine
Caliber:	6.8 II
Caliber:	.224 Valkyrie
Finish:	Black Nitride

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10 Reviews

5
Quality BCG

Posted by stacy thomas on Jan 16th 2026

ACME has some of the best prices on toolcraft items anywhere.
5
A+++

Posted by Chad O. on Apr 15th 2019

Great transaction!!
4
Purchased for a valkery build. Slipped into the

Posted by john w. on Sep 5th 2018

Purchased for a valkery build. Slipped into the upper and functioned flawlessly. Good price too.
5
The bcg works like top . Great workmanship

Posted by Eddie H. on Aug 26th 2018

The bcg works like top . Great workmanship fit like a glove. I will buy more bcg
5
Got it as part of the promo with

Posted by Troy M. on Aug 10th 2018

Got it as part of the promo with the BA .224 Valkyrie barrel. No complaints. Fits and functions smoothly as others have said with Toolcraft BCGs.
5
Got this for my .224 Valkyrie build. Supper

Posted by Eric P. on Jul 24th 2018

Got this for my .224 Valkyrie build. Supper fast shipping, got the shipping confirmation the same day the order was placed. The BCG has preformed flawlessly so far. Acme Machine is a fantastic vendor.
5
Top quality stuff! We definitely shop here often!

Posted by Rick D. on Jul 16th 2018

Top quality stuff! We definitely shop here often!
5
3 days !!! This Toolcraft BCG was at

Posted by Rodd Trickle on Jun 28th 2018

3 days !!! This Toolcraft BCG was at my door in 3 days ready to slide in Valkyrie!!
5
Fast and reliable shipping, great product Was having

Posted by Rckclmbr on Jun 14th 2018

Fast and reliable shipping, great product Was having a problem finding reasonable parts for a vakyrie build, stumbled across Acme, WOW! Great service, Great prices, fast shipping. Great all around experience.
5
BCGs These things are the best of the

Posted by Rick Dailey on Jun 12th 2018

BCGs These things are the best of the best and the ACME service is ALWAYS fast! Open your door when you place the order as they are already on the way...