Wow. As I sit here with a SAR4 in hand, I'd hesitate to add that if you (you the forum-reader you, not the OP) would always have a finger in that choil, the handle is STILL too long.
I get why the SAR handle is long - to be able to whack things with the butt-end. Hence the SAR name. But once you modify it for less SAR-like work, the handle becomes far too long. (OTOH, many Busse handles are far too long. The 3-series handle, with the protruding tang, is silly-long. The SF handle has always seemed long to me as well. But I digress.)
Cool mod!