AR-40/10 Standard .40 S&W / 10mm BCG (Glock Style Magazine AR Compatible)

New Frontier Armory

(2 reviews) Write a Review
0.86 LBS
.40 S&W / 10mm BCG
Pistol Cal
Black Nitride

AR-40 .40 S&W / 10mm Bolt Carrier Group - BCG

  • US Made 8620 steel with black nitride finish
  • Ramped carrier to work with both 9mm and standard AR hammers
  • Precision milled for use with Glock style lower receivers
  • M-16 cut for use in transferable full auto MG's, dealer post sample MG's or other legal machine guns (ALL BATFE RULES APPLY)
  • This bolt can also be used in a large frame lower to run 10mm

**NOTE: Many Aftermarket drop in triggers use modified hammers which may not reset properly, or hit the firing pin square on the carrier which could cause firing pins to bind and snap. We recommend using only MILSPEC hammers with any 9mm, .40, or .45 blowback bolt carrier groups.

**A small amount of Loctite is recommended on the set screw that holds the BCG weight in place. 

The New Frontier Armory AR-40 .40 S&W Bolt Carrier Group is proudly MADE IN THE USA by hard working American men and women.


DISCLAIMER: This product is not manufactured, authorized, endorsed,
or warranted by GLOCK. GLOCK does not warrant or represent that
this product is compatible with GLOCK pistols.

DISCLAIMER: “GLOCK” is a federally registered trademark of GLOCK,
Inc. and is one of many trademarks registered by GLOCK, Inc. and GLOCK
Ges.m.b.H. Neither New Frontier Armory nor this site are affiliated in any
manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK
Ges.m.b.H. The use of “GLOCK” on this page is merely to advertise the
sale of products compatible with GLOCK pistols, parts, or components. For
genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts visit

Weight: 0.86 LBS
Dimensions: 7.25 x 1.50 x 1.00 in
Color: Black Nitride

2 Reviews Hide Reviews Show Reviews

  • 5

    Posted by djriii40 on 14th Nov 2022

    Mine runs flawlessly as well, but only use with a standard barrel, not a ramp barrel, mine wouldn't work properly

  • 5

    Posted by BRICE MILBOURNE on 9th Oct 2021

    Got this about a year ago for a 16" barrel AR platform in 40 S&W. Finally was able to get a 10mm 16" barrel from here to use this bcg. The 40 S&W platform has run flawlessly.

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