![]() It is not, but if you look at it, it really is just a piece of thin steel bent a few different ways and slotted through the receiver. The LRBHO technology looks to be a bit flimsy. Not complaining, it just ended up being the most expensive AR I have ever done. I bought this because I wanted at least one of my AR's to fall into the "no blemishes" category. After one or two hick ups getting the bolt to actually stay to the rear after the last round, it has worked pretty much as advertised.ġ. I fired it first with a dedicated 9mm buffer, then switched to a standard carbine buffer and the NFA buffer spacer. It is a very attractive combination, fits together well, as you would expect.Ģ. This upper is mated to an NFA 9mm lower, and a NFA 9mm BCG so the review covers how they work together.ġ. My rating has it as a 5, but only because there is not an option for 4.5. ![]() ![]() Waited until I had a few hundred rounds through the pistol build using this upper before writing a review. The New Frontier Armory Pistol Caliber Billet AR-9/45 "Slick Side" Upper with LRBHOis proudly MADE IN THE USAby hard working American men and women. It is designed for flush mounting rails and standard hand guards. **NOTE: Some rail systems that use anti-rotation tabs may need slight modification to fit this upper. 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. They are set and function checked during assembly with brand new Glock magazines and our standard bolt catches. 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. 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. **NOTE - This upper is not machined for a gas tube as it is intended for blowback gas systems only.LRBHO feature is designed for lowers that accept Glock style magazines.Contains integrated Last Round Bolt Hold Open (LRBHO) technology (PATENT PENDING) that reliably holds the bolt open when magazine is empty.Designed to match lines with New Frontier Armory C-9 & C-45 Billet Lower.Save money by building your own AR-9 rifle or pistol from the ground up exactly the way you want it configured.Manufactured to MILSPEC on state of the art CNC equipment for consistent quality parts and exacting tolerances.Compatible with all standard AR-15 / AR-9 components and most aftermarket parts.Matte black hard-coat anodized per Mil 8625 Type 3 Class 2.Machined from 7075 T6 aircraft grade billet aluminum.Other Specifications and Features of the Billet AR-9/45 "Slick Side" Upper with LRBHO: Model: Pistol Caliber Billet AR-9/45 "Slick Side" Upper with LRBHO - PATENT PENDINGĬaliber:Multi (will accept any barrels, boltsand caliber designed for the AR-9/45 style platform) Pistol Caliber Billet AR-9/45 "Slick Side" Upper with LRBHO (Last Round Bolt Hold Open)
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