Black Rifle Arms 7.62x39 Mid-Length Low Profile Regulated Piston Upper, 4 Position Gas Regulated Piston Upper, AP 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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Questions and Answers
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Black Rifle Arms^® L.P.R. AR-15 Mid-Length 7.62x39 Piston Upper with Aero Precision 12" M-Lok Handguard

COMBAT ADAPTIVE PISTON SYSTEM:

4 Position Regulated Gas System
Pull Through Gas Block Design
Ambi-Regulator Knob
360° Continual Rotation
Easily Adjustable with One Hand
Easily Adjustable with Gloves On
Easily Adjustable from Firing Position
Audible and Palpable Setting Confirmation
No Detent Pin to Push In to Adjust Gas Regulator
Regulator Knob Allows for Zero Visibility Adjustment
Interlocking Mechanism Prevents Accidental Rotation of Knob
Knob Configured for Rapid Adjustment with No Loss of Target Engagement

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:

Manufacturer: Black Rifle Arms
Material: 4150 CrMov
Barrel Length: 16"
Twist: 1:10
Nitrided: Inside and Out
Contour: Medium Tactical
Chamber: 7.62x39
Feed Ramps: Enhanced M4 Barrel Extension Specifically Designed for 30 Caliber Size Bullets
Thread: 5/8x24"

Q: Does this upper fit aero precision ar10/m5 lower?

Asked by: Sup - 8/4/2025

A: NO, this caliber (7.62x39) is an AR-15 and only is compatible with AR-15 lowers. The Aero Precision AR10/M5 lowers fit with our .308/7.62x51 piston uppers which you an find here: https://www.blackriflearms.com/AR-308-PISTON-UPPERS_c_115.html

Answer provided by: Administrator (8/4/2025)

Q: Do you need a buffer and buffer tube system with these piston uppers?

Asked by: Jonny Bravo - 4/20/2024

A: Our piston uppers do require a Mil-Spec lower with buffer and spring.

Answer provided by: Administrator (4/22/2024)

Q: Can I order this in a left handed

Asked by: Mark - 2/10/2023

A: Sorry we do not manufacturer left handed piston uppers.

Answer provided by: Administrator (2/23/2023)

Q: does L.P.R. 7.62x39 mid length piston upper come with the enhanced bolt carrier group

Asked by: raymond - 1/6/2022

A: Yes our bolt carrier groups are a specifically designed piston bolt carrier group with the buffer technology. We updated the products page to include this photo as the other photo was deleted and wasn't up to date.

Answer provided by: Administrator (1/6/2022)

Q: will this shoot lacquer wolf crap with out breaking the extractor?..... ahhh I mean ammo? Thanks!

Asked by: Tracy Ziemke - 6/14/2020

A: You can shoot anything; however, certain ammunition like Tula will shorten the life of bolts/extractors and cause premature failures. Extractors will break eventually in this caliber due to how thin the walls are machined and other things will contribute to a shorter extractor and/or bolt life like overgassing.

Answer provided by: Administrator (6/15/2020)

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