Answer
Nov 07, 2025 - 09:51 AM
The AR15 version of the Brass Goat (BG15) is compatible with milspec lower receivers. The Sig MCX is technically not a milspec lower receiver, but we have tested the BG15 with this firearm in several military units overseas. This is the feedback that they gave:
"Despite the Brass GOAT not fitting perfectly to the non mil spec lower, the GOAT actually worked fine on the MCX with just the occasional movement on the lower."
We do have a 30-day money back guarantee if you not satisfied you can send it back for a refund.
