I tried to verify that the springer basepads are production legal with them, but couldn't get a straight answer. Anyone actually looked, measured, and weighed them to clarify their legality. I know they are heavy but with the +4oz rule I don't think it will be problem. Its primarily size in the box I am worried about.
https://shop.springerprecision.com/product.sc?productId=327&categoryId=51
Those are the ones I am looking at.