Answer
Feb 17, 2026 - 12:29 PM
The Nemo Arms .300 Win Mag is a larger AR-style rifle (AR10-type). Unlike AR15s, AR10 rifles don’t follow one standard size, so the lower receiver dimensions can vary from brand to brand.
Our Brass Goat for the AR10 (BG10) is made to adjust for those differences. It comes with five shims that let you dial in the fit to your specific rifle.
Nemo Arms isn’t currently on our confirmed fit list, so we can’t guarantee it without testing. However, many large-frame AR rifles do work using the included shim system. You can return the Brass Goat for a full refund within 30-days if it doesn't fit.
