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Billet 9MM/45ACP Billet AR15 Upper Receiver w/ LRBHO

NFA 9MM/45ACP Billet AR15 Upper Receiver w/ LRBHO

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Our Price: $139.95

Quantity in Stock:(Out of Stock)

Availability:: Usually Ships in 24 to 72 Hours
Product Code: SPAR-9-UP

Billet 9MM/45ACP Billet AR15 Upper Receiver w/ Last Round Bolt Hold Open (LRBHO)

Works for 9MM, .40S&W, 10MM, and .45ACP AR Builds!

-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 Glock style magazines
-Weight: 8.8oz
-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.

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