I've had an original GL without the cheek riser since 2011. I originally bought it for a .308 AR. I have since put an A1 on the .308 and have the GL on one the 5.56 rifles. It is solid and good quality. It does not rattle and mine has a QD sling mount. IDK if the new ones still have that. I wouldn't specifically buy one for a .223 / 5.56 but it should be a benefit on your .450.
Good luck.