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

Looking for the best Gas Piston System. Look no further! Black Rifle Arms has developed the most innovated Gas Piston Systems, best bolt carrier groups, enhanced firing pins, extended firing pins, gas piston, piston, piston uppers, 300BLK Piston Uppers

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Black Rifle Arms^® AR-15 10" 300BLK Complete Low Profile Piston Upper with 9" Aero Precision Enhanced M-Lok Handguard

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Q: Can the 300 Blackout upper be used with a Shields Arms folding lower?

Asked by: Tex5 - 2/3/2025

A: Looks like it would work fine. Our doesn't work with folder lowers that you have to stick an adaptor into the back of the carrier like the Law Folder.

Answer provided by: Administrator (2/21/2025)

Q: Can this upper be used with the AP M4E1 threaded upper? If so, could y'all install it with the piston system? If this can be done, y'all have me sold even if it costs a little extra. Thanks!

Asked by: Jared - 5/15/2024

No Answers have been submitted yet.

Q: Part Number: 1607243. I purchased one of these a while back. My question is about the BCG and if it is full auto rated (for binary setup). If it isn’t, is there a compatible piston driven BCG that you can recommend.

Asked by: Danel Kalloo - 5/18/2023

A: All of our bcg are m14 for full auto.

Answer provided by: Administrator (5/23/2023)

Q: what is the bolt material and finish? what is the carrier material and finish? is the carrier chrome lined for the bolt?

Asked by: Fred Evers - 9/1/2022

A: Because our carriers are NiB we do not need to chrome line them. Here our the specs:

PISTON BOLT CARRIER SPECS:
Bolt Carrier Material, 8620
Bolt Carrier Nickel Boron Coating
Bolt body produced from AISI 9310 VAR (Vacuum Arc Remelt) and Nitrided, Extractor produced from MIL-S-5000 steel and vacuum hardened

Answer provided by: Black Rifle Arms Sales Team (9/1/2022)

Q: I will be shooting mostly suppressed and subsonic ammo, is there any adjustment for the piston or is it needed and what manufactures barrel do you use?

Asked by: Bryan Hollingsworth - 2/12/2022

A: Our 300BLK was designed to run optimally between super and subs without the need to adjust. Our barrels are manufactured by Shaw Barrels for us according to our specs.

Answer provided by: Administrator (2/17/2022)

Q: Why isnt this compatible with law tactical folder? Is it specific to your BCG?

Asked by: Michael Domer - 12/17/2020

A: The Law Tactical golder has a part that has to be inserted in the bolt carrier and because we use a polymer insert it makes our bolt carriers incompatible with any folders.

Answer provided by: Black Rifle Arms Sales Team (12/19/2020)

Q: Is there any other rails that can fit this?

Asked by: Jake Simon - 6/19/2020

A: No, we designed our proprietary barrel to use exclusively with Aero Precision Enhanced Hanguards.

Answer provided by: Administrator (6/21/2020)

Q: Does these have Pistol length gas system? Thank you.

Asked by: RL Bone - 6/9/2020

A: Yes these uppers have a pistol length gas system.

Answer provided by: Customer Service (6/9/2020)

Q: What forend systems is this compatible with?

Asked by: Dane - 11/30/2019

A: We specifically designed this particular piston system to fit with the Aero Precision Enhanced handguards using our proprietary steel piston barrel nut. Since we didn't design this piston system to fit with other handguards we are unaware of any other handguards that are compatible.

Answer provided by: Administrator (11/30/2019)

Q: What buffer is reccomened with this upper?

Asked by: Maxwell - 9/18/2019

A: For our 300BLK Piston Uppers, we recommend H2 Buffer and Standard Carbine Spring. https://www.blackriflearms.com/FAQ_ep_55.html

Answer provided by: Charles Cassels (9/18/2019)

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Black Rifle Arms^® AR-15 10" 300BLK Complete Low Profile Piston Upper with 9" Aero Precision Enhanced M-Lok Handguard

Our 300BLK complete upper is a low profile self-regulating gas piston system that was designed to shoot supersonic and subsonic ammunition 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: 10"
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

UPPER RECEIVER SPECS:

Complete upper with A2 flash hider OAL is 18 3/8".
Complete upper without A2 flash hider OAL is 17 3/16"
Weight including BCG: 3 lbs. 5.6 oz.

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10" 300BLK Complete Low Profile Piston Upper with A.P. 9" M-Lok Handguard

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