Same here. This is what I use also. I had to use the pistol version. The rifle version is to long to fit into my ejection port. I am shooting a Just Right Carbine.
A search found no mention of this. I know Burris does not offer a cover for their FF3. I found this site by accident. Sold in pairs for $9.95. Received mine today. Good choice.
https://dreamplastics.com/index.php?route=product/product&product_id=68
This would be my only concern: Fits most aisoft and paintball guns, and all standard Picatinny rails and 5/16 Threaded for Match Bow Mounts
Could it handle the recoil?
I LOVE mine too. Started with a XD9 service. When the 5.25 came out I switched to that for USPSA and now use my XD9 for carry. I put a FF3 on it for carry optics. I am waiting for the 5.25 to be offered with the slide cut for optics in bi tone.
I have contacted 2 different well known companies. Both said that due to Springfield's design for it's safeties and such, that they could not mill the slide for an optic.