The NBS 8.3″ 9mm M-LOK Complete Upper with LRBHO is an excellent choice for your next Pistol or NFA compliant SBR build. We started with the excellent New Frontier Billet PCC Upper Receiver which features a patented Last Round Bolt Hold-Open (LRBHO) mechanism. At the heart of the upper is an 8.3″ QPQ Nitride 9mm barrel w/ a tapered profile and a generous feed cone to ensure reliable cycling. We’ve installed a flash can which results in reduced concussion and perceived noise levels but that can easily be swapped for a muzzle device of your choosing or suppressor. The upper also features a QPQ Nitride Toolcraft Gen2 BCG with a durable M16 style extractor and a mil-spec charging handle. The popular NBS M-LOK Handguard features a full length top rail and M-LOK mounting slots on all sides.
Note: LRBHO function will only work with Glock style AR-9 Lowers.
This upper is backed by the NBS Limited Lifetime Warranty in addition to the AR15Discounts satisfaction guarantee. Purchase with confidence, install it, run it and if you aren’t happy for any reason, return it within 30 days for a full refund.
| Weight | 18 oz |
|---|---|
| Dimensions | 20 × 5 × 5 in |
| Barrel Finish | Nitride / Melonite |
| Barrel Profile | Medium |
| Cartridge Compatibility | 9mm |
| Barrel Length | 8 |
| Gas System Length | N/A |
| Twist Rate | 1-10 |
| BCG / Charging Handle | Included |
| MPN | 3523 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Customer Reviews
- Reviews
- Questions
United StatesEhh
The upper is very well made and I love the look of it, but after completing the pistol build I have yet to be able to fire a round. When I load the magazine and try to chamber a round it jams, the tip of the bullet goes into the barrel, but the casing gets stuck, tried multiple ammo manufacturers and still the same issue. Not sure what the issue is. But it’s been a stressful build to say the least.
AR15Discounts.com
Hello, I apologize for the, less-than-satisfactory, experience that you had with this item, as this should never happen. I want to make sure that you enjoy your order and you are satisfied with your build. If you would like, you can reach out to us at [email protected] and we would be more than happy to help you out. Please let me know if you have any other questions or concerns. Best, Michael Earnest
