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BCM 13.7" Prototype Uppers

methical20

Joined: Sep 2013

Posts: 437

EE: 95% (19)

USA

Posted: 4/1/2026 4:16:44 PM EDT

Does anyone have any info on the BCM 13.7" prototype uppers floating around? With as many 13.7 barrels out there as there are, I can't imagine testing the proper gas port would take that long..

cdholmes

Joined: Nov 2014

Posts: 4343

EE: 100% (359)

SC, USA

Posted: 4/2/2026 12:35:46 PM EDT

[#1]

Where have you seen those?

BULLDAWG_556

Joined: Mar 2004

Posts: 3751

EE: 100% (88)

NC, USA

Posted: 4/2/2026 5:05:21 PM EDT

[#2]

I had a 16” BFM cut to 13.7 and had a NOX pinned on it. I left the gas alone at what I believe (read on the net) is .076.

It runs fantastic with a carbine buffer unsuppressed and an H1 suppressed.

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BCM 13.7" Prototype Uppers

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BCM 13.7" Prototype Uppers

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BCM 13.7" Prototype Uppers