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AR-15 PISTON UPPERS
300 BLACKOUT PISTON UPPERS
8" 300BLK Complete Low Profile Piston Upper with A.P. 7" M-Lok Handguard
8' 300BLK Complete Low Profile Piston Upper with A.P. 7' M-Lok Handguard
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8" 300BLK Complete Low Profile Piston Upper with A.P. 7" M-Lok Handguard
Your Price:
$1,024.99
Questions about this item? Ask here.
Part Number:
1803141
Availability:
IN-STOCK | BUILD TO ORDER
Choose Options
SIGHT OPTIONS
SIGHT OPTIONS
No Sights
Magpul MBUS Pro Flip Up Front and Rear Sights (+$195.99)
CHARGING HANDLE OPTIONS
CHARGING HANDLE OPTIONS
Mil-Spec Charging Handle
Remove Mil-Spec Charging Handle (-$15.00)
Add Radian Raptor Ambidextrous Charging Handle - BLK (+$74.00)
Add Radian Raptor Ambidextrous Charging Handle - FDE/BLK (+$74.00)
Add Radian Raptor SD Ambidextrous Charging Handle - BLK (+$94.00)
Add Radian Raptor SD Ambidextrous Charging Handle - FDE/BLK (+$94.00)
MUZZLE DEVICE OPTIONS
MUZZLE DEVICE OPTIONS
Remove A2 Flash Hider and Crush Washer (-$14.00)
Add RM-30 Muzzle Device (+$50.00)
SPARE BOLT CARRIER BUFFER OPTIONS
SPARE BOLT CARRIER BUFFER OPTIONS
No
Yes (+$10.00)
CERAKOTE OPTIONS - CERAKOTE OPTION ADDS 1 to 3 WEEKS TO A BUILD
CERAKOTE OPTIONS - CERAKOTE OPTION ADDS 1 to 3 WEEKS TO A BUILD
No Cerakote
Handguard (+$65.00)
Upper Receiver (+$75.00)
Upper Receiver, Forward Assist and Dust Cover (+$100.00)
Upper Receiver, Forward Assist, Dust Cover and Charging Handle (+$120.00)
Handguard and Upper Receiver (+$145.00)
Handguard, Upper Receiver and Charging Handle (+$175.00)
Handguard, Upper Receiver, Forward Assist and Dust Cover (+$185.00)
Handguard, Upper Receiver, Charging Handle, Forward Assist and Dust Cover (+$200.00)
CERAKOTE PATTERN
CERAKOTE PATTERN
Not Applicable
Solid - 1 Cerakote Color Needed
Battleworn - 2 Cerakote Colors Needed (+$60.00)
CERAKOTE COLOR - 1 COLOR OPTION
Not Applicable
Blue Titanium
Titanium
Tungsten
Stainless
Cobalt
Midnight Bronze
Burnt Bronze
Satin Aluminum
Tactical Grey
Sniper Grey
Smith Wesson Grey
Noveske Bazooka Green
Glock FDE
Coyote Tan
Desert Sand
Magpul FDE
Magpul Foliage Green
Magpul OD Green
Sky Blue
High Vis Orange
USMC Red
Crimson Red
Gold
Bright White
Blackout
Graphite Black
CERAKOTE COLOR - 2 COLORS OPTIONAL
Not Applicable
Blue Titanium (+$25.00)
Titanium (+$25.00)
Tungsten (+$25.00)
Stainless (+$25.00)
Cobalt (+$25.00)
Midnight Bronze (+$25.00)
Burnt Bronze (+$25.00)
Satin Aluminum (+$25.00)
Tactical Grey (+$25.00)
Sniper Grey (+$25.00)
Smith Wesson Grey (+$25.00)
Noveske Bazooka Green (+$25.00)
Glock FDE (+$25.00)
Coyote Tan (+$25.00)
Desert Sand (+$25.00)
Magpul FDE (+$25.00)
Magpul Foliage Green (+$25.00)
Magpul OD Green (+$25.00)
Sky Blue (+$25.00)
High Vis Orange (+$25.00)
USMC Red
Crimson Red (+$25.00)
Gold (+$25.00)
Bright White (+$25.00)
Blackout (+$25.00)
Graphite Black (+$25.00)
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Description
Product Features
Questions and Answers
Product Specifications
Ship Requirements
Black Rifle Arms
®
AR-15 8" 300BLK Complete Low Profile Piston Upper with 7" Aero Precision Enhanced M-Lok Handguard
7075-T6 Aluminum Forging :
✓
Piston Upper Fits Any Mil-Spec AR-15 Lower:
✓
One Piece Bolt Carrier Group with Buffer Technology:
✓
Aero Precision Enhanced M-Lok Handguard with Hardened Steel Piston Barrel Nut:
✓
Piston Bolt Carrier Law Folder Compatible :
X
View all Q&A
×
Questions and Answers
Q:
Looks like you use the aero enhanced handgaurd. Do you also use their stripped upper for this completed upper? (Curious about fit with their lower)
Asked by:
Bobthebuilder
- 1/9/2023
A:
We use our own uppers that are spec'd to our drawings as we use a rocker bushing in our 300BLK in order to rock the op rod out on pistol gas operating length uppers. You can see our 300BLK piston upper video in how the rocker bushing works here: https://www.blackriflearms.com/PISTON-VIDEOS_ep_40.html
We have not heard of any fitment issues with Aero lowers.
Answer provided by:
Administrator (1/16/2023)
Q:
Is there a way to order just the handguard and barrel nut for the piston system on your 8 inch complete upper?
Asked by:
Brandon Mitchell
- 9/22/2022
A:
No, not at this time as we designed our proprietary barrel nut for use with Aero Enhanced Handguard with our piston uppers.
Answer provided by:
Administrator (1/16/2023)
Q:
Does this come with the required buffer adapter for a mil-spec AR15 lower?
Asked by:
Eric
- 9/8/2022
A:
No, this product is a complete upper with no lower parts included. This complete upper is ready to pin onto a complete lower. Buffer or any lower parts are considered lower parts and not part of this complete upper.
Answer provided by:
Administrator (9/8/2022)
Q:
is the piston system adjustable?
Asked by:
Josh
- 5/24/2022
A:
Our 300 Blackout system is nonadjustable. It was determined during our R&D process that by utilizing a piston of a particular size and proper positioning of the gas port location we could achieve outstanding reliability without adding the complexity of a regulated system. Although we are known for our regulated piston systems and really believe in them only because they offer significant benefits with typical rifle calibers especially with suppressed firearm due to suppressor backpressure that may increase bolt carrier velocity by as much as 30 percent. Our regulators provide a means to mitigate over gas situation and compensate for underpowered ammunition as well. All of which is common with standard rifle calibers. However, 300BLK self-mitigates these gassing issues to a significate degree by virtue of its design. For example, with subsonic ammunition you have a bullet that is typically twice the weight of a supersonic bullet, and it is moving at less than haft the velocity. This creates a situation where subsonic bullets are in the barrel about twice as long providing a longer gas impulse. Conversely supersonic bullets are moving about twice as fast and at much higher pressure. These characteristics enable us to utilize our piston system and gas port positioning to effectively balance between the longer dwell time of subs versus higher peek pressure of supersonic ammunition. The key here is we balancing gas pressure and dwell time with piston size and gas port positioning to optimize reliability, thus eliminating the need to regulate our 300BLK system.
Answer provided by:
Black Rifle Arms Sales Team (6/7/2022)
Q:
Is it a full auto bolt? Is upper cut to fit a registered drop in auto sear?
Asked by:
Rick
- 12/25/2021
A:
Yes our bolt carriers are full auto. Our uppers are mil-spec so any drop in auto sear designed to be used in mil-spec uppers will work. We run our systems full auto all the time.
Answer provided by:
Administrator (12/28/2021)
Q:
Do the 300 blk uppers come with a bolt carrier.
Asked by:
Jake
- 1/6/2021
A:
Yes it comes with a bolt carrier. It's a complete upper receiver ready to be pinned onto a lower.
Answer provided by:
Black Rifle Arms Sales Team (1/7/2021)
Q:
when will these back in stock? Thank you.
Asked by:
RLBone
- 6/9/2020
A:
We estimate in about 3 to 4 weeks, but it could be a little longer.
Answer provided by:
Customer Service (6/9/2020)
Q:
Will this cycle sub loads with or without suppressor attached?
Asked by:
RL Bone
- 5/10/2020
A:
Due to the length of the 8" barrel, it may not lock the bolt back on the last round. The 8" 300BLK will shoot subsonic optimally with a silencer and supersonic with or without a silencer. If you want to shoot subs with or without a silencer please look at the 10" 300BLK piston uppers.
Answer provided by:
Administrator (5/10/2020)
Q:
Are the barrels nuts available for sale separately?
Asked by:
Josh
- 5/6/2020
A:
Sorry, we do not sell these separately. They are designed to be utilized with our uppers and conversions.
Answer provided by:
Customer Service (5/6/2020)
Q:
When will this upper be back in stock?
Asked by:
Joseph Diaz
- 4/9/2020
A:
Barrels are in production now, so we are hoping in about 4 to 6 weeks.
Answer provided by:
Charles Cassels (4/10/2020)
Questions about this item? Ask here.
Black Rifle Arms
®
AR-15 8" 300BLK Complete Low Profile Piston Upper with 7" Aero Precision Enhanced M-Lok Handguard
Our 300BLK complete upper is a low profile self-regulating gas piston system that was designed to shoot subsonic optimally with a silencer and supersonic with or without a silencer, and utilizes a standard AR-15 carbine buffer and spring for reliable performance.
HANDGUARD SPECS:
1-pc Free Float Design
Built-in Anti-Rotation Tabs
Scalloped Rails
Continuous Top Rail
1.72" Inside Diameter (from barrel nut to forward end)
Fits Most Muzzle Devices and 1.5" Suppressors
Gen 2 Features:
Quick Disconnect Sling Socket at 3, 6 and 9 O'clock Positions
Additional Milling Along Flats to Aid with Gripping and Add Visual Appeal
New Profile for Continuous Picatinny Top Rail
BARREL SPECS:
Barrel Manufacturer: Black Rifle Arms
Caliber: 300BLK
Length: 8"
Gas Length: Pistol
Material: 4150 CrMoV 11595E Steel
Profile: Medium Tactical
1/7 Twist
5/8-24 Threaded Muzzle
Gas Block Journal: 750"
Nitride: Inside and Out
Barrel Extension: NiB
Feed Ramp: Enhanced M4 Barrel Extension Specifically Designed for 30 Caliber Size Bullets
Barrel Extension Installed and Torqued After Nitride Finish: Yes
Rifle Barrel Blanks are Air Gauged to ± .00002"
Air Gauging Ensures that Rifle Barrel Blanks Feature Perfect Bore Diameter Uniformity for Maximum Accuracy
PISTON BOLT CARRIER SPECS:
Bolt Carrier Material, 8620
Bolt Carrier Nickel Boron Coating
Standard Firing Pin
Bolt body produced from AISI 9310 VAR (Vacuum Arc Remelt), the highest standard bolt material made
Machined completely in one operation; this eliminates tolerance and repeatability issues that arise from the multiple fixturing processes used by other manufacturers
Enhanced Design for utmost reliability
Tightly controlled proprietary heat treat process to accurately control cast depth and core hardness
Extractor produced from MIL-S-5000 steel and vacuum hardened
NSCW Crane Division extractor upgraded with Viton® O-ring, 5 coil spring, and plunger
Cam Pin, Melonite QPQ
Firing Pin Retaining Pin
Oversized Size Integrated Polymer Buffer
Eliminates Carrier Tilt
Eliminates metal on metal contact
Eliminates contact between the hardened steel carrier, aluminum receiver extension and buffer
Eliminates hardened steel carrier as it transitions between upper and lower receivers
Self-lubricating, shock-absorbing and has seven times the abrasion resistance of carbon steel
Reduction in felt recoil and vibration
Shipping Information or Requirements:
NO FFL REQUIRED - Ships Directly to Customer: ?
REQUIRES SIGNATURE UPON DELIVERY: ?
ALL NFA RULES APPLY: ?
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