Game changer! The original helix mag, great design, had one disappointing drawback for me - having to slap, kick, punch or headbutt the mag to get it seated in the magwell properly. With this 2017 updated part, the mags fit in first time just by pushing. The time saved on reload is remarkable and not having unwelcome palm bruises can only benefit. Seriously, if you haven't got these updated mags; get them. GET THEM NOW!