Fm-15 stovepipes

Anyone run into FTE stovepipe issues with the Phantom Pup?

I am running a FM-15 with a 16" barrel and Sylvan arms AGB on it.

Recently started to get stovepipes every few rounds.

I checked the extractor and the pin etc is intact.

Reaching out to FM about it they definitely indicated that it would only reliably work with their dedicated lower or the FM pic rail adapter.