The MSG-90 is a militarized variant of the PSG-1, that is both strengthened and lightened. The PSG-1 and MSG-90 share the same trigger group and adjustable trigger shoe. The composite shoulder stock of the MSG=90 is adjustable for height (cheek), length of pull (shoulder), and is smaller and lighter than that of the PSG-1. MSG-90s have a slightly shorter contoured barrel to help with harmonic stabilization and consistent whip instead of the PSG-1's heavy barrel, but remain free-floating. As a result, these particular MSG-90 A1's have a threaded barrel capable of attaching a suppressor, which is an advantage over the PSG-1