I appreciate the compliments to the sporter! I do want to ask why you would suggest we "saved a ton of machining time", and for the life of me I can't find what sharp corners you are refering to. Every edge is radiused/"broken" so as not to leave anything sharp... Is it just our choice of design and aesthetics to which you're refering?
With a much thicker and more rigid billet receiver set, it is necessary to open a slot for the bolt catch to function, we oversized it to allow compatibility with phase5 and BAD levers.
Shouldn't be an issue, however you are more than welcome to stop by with your parts and we can test fit them. That offer is an open offer to anyone who is holding onto a parts bin wondering about compatibility.