M4-89 .300 AAC Blackout Assembled Upper Receiver 13.9" Barrel M489UPPER-13.9-300

M4-89 M4-89 300 AAC BLACKOUT ASSEMBLED UPPER RECEIVER M489UPPER-13.9-300—M4-89 M489UPPER-13.9-300 .300 AAC Blackout Assembled Upper Receiver Black Supreme Modular Supreme. M4-89 Upper Supreme.

What is M489UPPER-13.9-300?

The M4-89 M489UPPER-13.9-300 Assembled Upper Receiver for .300 AAC Blackout 13.9 Inch Barrel Supreme Complete Supreme supreme. Model M489UPPER-13.9-300; m4-89 300 blackout upper 13.9 assembled.

Key Features of M4-89 Upper:

• Caliber: .300 AAC Blackout.
• Barrel Length: 13.9":
• Assembled Upper Receiver:
• Black Finish:
• M-LOK or Rail Compatible:

Why Choose M489UPPER-13.9-300?

Upper Supreme m489upper-13.9-300 m4-89. M489UPPER-13.9-300 300blk. Upper Supreme M489UPPER-13.9-300!

Specifications:

Customer Reviews:

"M489UPPER-13.9-300 blackout boom!" – AR Builder
"13.9 tactical." – Suppressor Shooter
"M4-89 mil-spec." – Upper Supreme

Blackout Supreme M4-89 300 AAC BLACKOUT ASSEMBLED UPPER RECEIVER M489UPPER-13.9-300!

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