Black Rifle Arms 8" 300BLK Piston Upper with Aero Precision M-Lok Rail

Description
Product Features
Questions and Answers
Ship Requirements

Black Rifle Arms^® AR-15 8" 300BLK Complete Low Profile Piston Upper with Aero Precision 12" Enhanced M-Lok Handguard

Caution: If using a handguard that extends beyond the barrel a suppressor or blast shield must be used to prevent discharge gasses from blasting through the handguard

Our 300BLK complete upper is a low profile self-regulating gas piston system that was designed to shoot subsonic optimally with a silencer (some manufacturers low back-pressure suppressors may cause cycling issues) 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:

Eliminated Half the 3, 6 and 9 O'Clock Picatinny Rails

Reduces Weight
Provides A More Ergonomics Design in the Rear Gripping Area

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

UPPER RECEIVER SPECS:

Complete Upper OAL: 20"
Weight including BCG: 3 lbs. 6.5 oz.

Q: Will you build this left handed with no forward assist or dust cover?

Asked by: Ron - 11/19/2023

A: In order to build left handed we need left handed uppers and left handed bolt carrier and bolt assemblies and there has not been enough interest in left hand piston builds to put them in production. In machining we have to meet minimal numbers to run and the interest has just not been there.

Answer provided by: Administrator (11/24/2023)

Q: Hello, I’m looking to build a piston 300 blackout truck gun, and this seems to check all of the boxes. Is the piston gas system adjustable at all? I’m relatively new to piston systems so please excuse my ignorance. Thank you! Lyman

Asked by: Lyman Gillen - 3/23/2023

A: We do not regulate our 300BLK. You can read more at our blog as to why the 300BLK do not need to be regulated: https://www.blackriflearms.com/Our-300BLK-dont-need-to-be-regulatedSEE-WHY_b_14.html

Answer provided by: Administrator (3/31/2023)

Q: When piston upper is in place, what can I put in place of the buffer? What type of collaspable but stock is available? I am wanting to build a backpack weapon to carry in my job.

Asked by: Warrior Ammo - 1/16/2023

A: You could use the Strikes Industries PDW Viper stock and utilize our Enhanced Buffer, Spring & Buffer Tube Assemblies for Viper PDW Stocks & Braces - Gen 2. It's what we use and share a pic of our set up; however, the buffer tube in the page picture shows the Gen1 buffer tube we have since changed the design but hold the same tolerances. https://www.blackriflearms.com/Enhanced-Buffer-Spring-Buffer-Tube-Assemblies-for-Viper-PDW-Stocks-Braces--Gen-2_p_732.html

Answer provided by: Administrator (1/16/2023)

Q: Apologies to add to what I'm sure is an overwhelming number of messages and queries about stock and out of stock items, but I'm interested in purchasing two x 8" .300 Blackout Piston Complete Uppers w/12" Handguards (one of each or two of the same of either 12" handguard styles is fine). I tried to find the information on your website but was unable. Any ETA on restock?

Asked by: Hunter - 8/11/2021

A: We are expecting restock of all our uppers around end of summer. Barrels are in production now and waiting on nitride and barrel extensions are at NiB waiting on plating so almost there.

Answer provided by: Administrator (8/12/2021)

Q: I am interested in your gas piston 8" .300 Upper. Who's BCG do you use? Is it full auto rated? Who's gas block do you use ? Is it adjustable? I plan to use a Fostech Echo II binary trigger Any issues? I plan to suppress it. Isues? Do you have a recommendation for a suppressor? Thanks Dave

Asked by: Dave - 12/20/2020

A: Our piston systems are patented by our owner, so our bolt carriers, gas blocks etc are manufactured by us. In a 300BLK you do not need to regulate the system. All of our piston systems can run full auto (we R&D, etc only using full auto and we suppress also). All our systems can be used full auto with no issues. Charles uses OSS and Dead Air Silencers. You may learn more about our 300BLK by going to our piston video page and scrolling down to 300BLK Piston Video: https://blackriflearms.com/PISTON-VIDEOS_ep_40.html

Answer provided by: Black Rifle Arms Sales Team (12/21/2020)

Questions about this item? Ask here.

CHECKOUT MINIMUM

TIME TO FULFILL ORDERS

AVERAGE SHIPPING TRANSIT TIMES
NOT INCLUDING HOLIDAYS

8" 300BLK Complete Low Profile Piston Upper with A.P. 12" M-Lok Handguard

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Q: Will you build this left handed with no forward assist or dust cover?

Q: Hello, I’m looking to build a piston 300 blackout truck gun, and this seems to check all of the boxes. Is the piston gas system adjustable at all? I’m relatively new to piston systems so please excuse my ignorance. Thank you! Lyman

Q: When piston upper is in place, what can I put in place of the buffer? What type of collaspable but stock is available? I am wanting to build a backpack weapon to carry in my job.

Q: I am interested in your gas piston 8" .300 Upper. Who's BCG do you use? Is it full auto rated? Who's gas block do you use ? Is it adjustable? I plan to use a Fostech Echo II binary trigger Any issues? I plan to suppress it. Isues? Do you have a recommendation for a suppressor? Thanks Dave

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CHECKOUT MINIMUM

TIME TO FULFILL ORDERS

AVERAGE SHIPPING TRANSIT TIMES NOT INCLUDING HOLIDAYS

8" 300BLK Complete Low Profile Piston Upper with A.P. 12" M-Lok Handguard

Choose Options

Q: Will you build this left handed with no forward assist or dust cover?

Q: Hello, I’m looking to build a piston 300 blackout truck gun, and this seems to check all of the boxes. Is the piston gas system adjustable at all? I’m relatively new to piston systems so please excuse my ignorance. Thank you! Lyman

Q: When piston upper is in place, what can I put in place of the buffer? What type of collaspable but stock is available? I am wanting to build a backpack weapon to carry in my job.

Q: I am interested in your gas piston 8" .300 Upper. Who's BCG do you use? Is it full auto rated? Who's gas block do you use ? Is it adjustable? I plan to use a Fostech Echo II binary trigger Any issues? I plan to suppress it. Isues? Do you have a recommendation for a suppressor? Thanks Dave

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Recently Viewed Items

AVERAGE SHIPPING TRANSIT TIMES
NOT INCLUDING HOLIDAYS