Enjoy free shipping during the holidays! Shop now and get
Free Value Shipping
on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.
Enjoy Our Extended FREE RETURNS
We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended
Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended
return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later).
We'll even cover the cost of return shipping. Learn more about our
Return Policy.
Please Enable Your Browser's Cookies Functionality
Cookies are not currently enabled in your browser, and due to this the functionality of our site will be severely restricted.
Web browser based cookies allow us to customize our site for you, save items in your cart,
and provide you with a great experience when shopping OpticsPlanet.
Your privacy is important to us, and any personal information you supply to us is kept strictly confidential.
If you cannot enable cookies in your browser, please contact us — we are always here to help!
JavaScript is blocked by AdBlocker or ScriptBlocker
We're sorry - it looks like some elements of OpticsPlanet are being disabled by your AdBlocker.
Unfortunately we are unable to offer our excellent shopping experience without JavaScript.
Please add "opticsplanet.com" and "https://opl.0ps.us/assets-ac483a73966/" to whitelist,
or disable AdBlocker for this site (please note that we do NOT feature any annoying ads on this website).
Thanks!
Your Browser is Outdated
Unfortunately, we are unable to provide an excellent shopping experience on your browser because it lacks modern functionality needed for us
to provide a fast, secure, and enjoyable experience. If you cannot upgrade your browser or use an alternative device to visit us,
please contact us at +1-800-504-5897 and we'll be happy to assist you over the phone!
Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly w/ Free S&H — 2 models
I purchased the 8 inch 300blk upper and probably have 500 rds through it currently. Charging handle wore quickly to bare aluminum and I also had the gas tube misalign with the gas key causing damage, Jacob Grey handled it well though and repaired it ...
Read More...
Never heard of the brand but this upper was less than half what others i was looking at were. Pre matched parts make it pre tuned basically.
It also has some sweet weight reducing milling. So far it cycles 300 supers right out of the box on the low...
Read More...
The upper was leightweight, well built, charging handle was nice and muzzle flash. Polymer upper. Only draw back was front take down pin hole was very tight. Had to file down a bit. Other than that, very good and smooth.
The fit and finish of this upper assembly exudes quality from end to end. Have no lower to put it on yet but I have no doubt it’ll perform very well once it’s completed. The quality for the price I paid is well worth it!
Product Info for Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly
The Jacob Grey Ultralight Complete Upper Assembly was designed with the next generation AR-15 in mind. This AR-15 complete upper assembly is built around the 7075-T6 billet upper receiver specifically machined and cut in areas where excess material was unnecessary and areas that see excess use and wear, reinforced and strengthened to give a sleek, refined look, without losing the classic lines of the AR-15 platform. It comes standard with the JG designed free float 7-sided M-LOK hand-guard that is also lightweight and leaves plenty of room for customization or the addition of numerous accessories available for the AR-15 platform. The barrel is chambered in 300 Blackout with a 1:8 twist rate. The barrel is machined from 4150 chrome moly steel and black Nitride finished for corrosion resistance and accuracy. Each barrel is individually head-spaced to the Carpenter 158 bolt. Combined with the 8620 steel carrier and black Nitride finish, this complete upper assembly is extremely reliable and smooth shooting.
DISCLAIMER: Firearm specifications are subject to change at any time based on availability and supply chain shortage.
Specifications for Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly:
Manufacturer:
Jacob Grey Firearms
Caliber:
.300 AAC Blackout
Barrel Profile:
Pistol Caliber Taper, Medium Taper
Gas System Length:
Pistol Length
Barrel Twist Rate:
1-8
Threads per Inch:
5/8x24
Handguard Type:
Free-Float
Muzzle Device:
Brake
Finish:
Type III Class 2 Hardcoat Anodized
Color:
Black
Fabric/Material:
Aerospace Aluminum
Gas Block Journal Size-Diameter:
.075 in
Handguard Style:
Round Rail
Gun Rail:
M-LOK
Gun Type:
Rifle
Gun Make:
AR Platform
Gun Model:
AR-15
Weight:
7.7 oz
Barrel Material:
Chrome Moly
Gas Block Journal Size-Length:
1.9 in
Bolt Carrier Group Included:
MIL-SPEC
Magazine Included:
No
Charging Handle Included:
MIL-SPEC
Last Chance:
Yes
Mount Type:
M-LOK
Features of Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly
Compatible with most aftermarket/OEM handguards featuring indexing tabs
Billet 7075-T6 aerospace aluminum
Jacob Grey lightweight design
M4 feed ramps
Machined T-marks
Laser engraved logo
MIL-A-8625F Type III Class 2 hardcoat anodized flat black finish
Compatible with MIL-SPEC AR upper receiver parts
JG ULTRALIGHT Handguard
Package Contents:
Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly
Jacob Grey Firearms Ultralight 300 BO Complete Upper Assembly Orderable Models
Your Browser is Outdated
