BCG dissection

[montana]

The AR-15 TDP has some very specific call-outs for dimensions, materials, processes, and finishes in the BCG so that you have consistent and long-lasting mechanical articulation and gas system efficiency.

I’d like to see BCG manufacturers adopt the armorer’s tools for their own QC and certify them at least dimensionally to those specs, but this costs money due to having trained personnel running the checks with the proper tools.

BCM created their own air gauge tools to test their BCG's 3 bores..https://www.youtube.com/watch?v=BaFOZAwspYI