Azn, the Marushin had a plastic endoskeleton slide that had a mount for the BOMAR style sights (held in by a pin and the elevation adjustment screw). The sights are adjustable but strip REALLY easily (As I did mine). My USG also exploded during rapid shooting, causing the plastic slide rails to break off. Even JB weld couldn't fix it. I strongly reccomend against the Marushin product.