This cut is for use with the Aimpoint Acro. The Acro is slightly longer than the MPS, so we decided to split them up. Closed emitter is the future, and we love it. Our cuts are machined and cerakoted in-house. We want to provide the best quality cuts at a fair price. You won’t be able to see your stock irons as backups with this cut so we recommend upgrading to our Angry Bear Arms irons lineup to round out your awesome slide.