Skip to content
Snake River Armory
Lower Parts Kits
Lower Parts Misc.
Upper Receiver Parts
Gas Blocks & Tubes
Bolt Carrier Groups
Compensator, Muzzle Brakes, Flash Hiders
Optics & Sights
9mm / .40 S&W
Tools & Misc.
Nav Menu 2
Nav Menu 3
Billet 9MM/45ACP Billet AR15 Upper Receiver w/ LRBHO
Stock Status:In Stock
Billet 9MM/45ACP Billet AR15 Upper Receiver w/ Last Round Bolt Hold Open (LRBHO)
Works for 9MM, .40S&W, 10MM, and .45ACP AR Builds!
Check out our
C-5 Upper Receiver
if (LRBHO) is not
necessary, works for AR9.
-Manufactured from a solid block of Aircraft Grade 7075-T6 Billet Aluminum
-Matches up perfectly with our
Billet 9MM Glock Lower Receivers
& most forged lower receivers
-Will mate with any brand of Mil-Spec AR15 lower receiver and components
-Compatible with all standard AR-15 / AR-9 components and most aftermarket parts
-MIL-A-8625 Type III Hard Anodizing (Deep Black)
-Contains integrated Last Round Bolt Hold Open (LRBHO) technology (PATENT PENDING) that reliably holds the bolt open when magazine is empty
-LRBHO feature is designed for lowers that accept
-Compatible with battery assist devices including the Magpul BAD Lever and Tactical Link EBAL
-Manufactured by New Frontier Armory
Once assembled the small "hook" end of the wire form in the upper should be pushed up by the follower of an empty Glock magazine which will engage the bolt catch on the last round fired to hold the bolt in the locked position. If it does not engage, or engages before the last round is fired you can make VERY SMALL adjustments by SLIGHTLY bending the "hook" end down to lock faster or up to lock slower. They are set and function checked during assembly with brand new Glock magazines and our standard bolt catches. Because of varying magazine specs, magazine specs changing over the life of the product, different thicknesses of the pad on the bolt catch and other variables, this adjustment may be necessary with your specific parts.
If you are using
Magpul PMAG Glock Magazines
you will likely need to bend the LRBHO spring down to engage the follower correctly.
Aero Precision Stripped Upper Receiver
Anderson Assembled Upper Receiver
M5 .308 Assembled Upper Receiver - Anodized Black
Billet AR-15 Upper Receiver
Aero Precision Upper Receiver/Quantum Handguard Combo 12"
Aero Precision Assembled Upper Receiver
Anderson Stripped Upper Receiver
C-5 Billet AR-9 “Slick Side” Upper Receiver
All Rights Reserved. Built with Volusion.