Yeah, it was hit or miss with most M4s if they had BUIS, especially if they had ACOGs.
Side note, it was funny that for a while I had a BUIS on my M4 that had a broken retention catch or something. The post wouldn't stay down. It would have been a serious problem, except the ACOG was far enough back it held the post down. Yay mil-spec equipment!
Bookmarks