I have a number of rifles built with the PAWS aluminum alloy casting from Brownells, and I am happy.
I have a number of rifles built with the Parker Hale aluminum alloy casting from Sarco, and I am happy.

https://www.sarcoinc.com/m98-mauser-trigger-guard-hinged

Generally, I try to avoid Sarco, but I am ok with this product.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps