Perfect "Top Half" for a D.I.Y. Custom Pistol - Available with Window OR Wraparound Front Serrations The Brownells Iron Sight Slide for Sig P320 Compact enables you to build a custom Sig P320-style pistol with a slide that sports distinctive cocking serrations. The front serrations aid in manipulating the slide, especially for quick chamber checks AND for clearing the occasional jam (caused by problem ammo, of course!). You can get your Brownells Iron Sight Slide for Sig P320 Compact with a solid top OR a window cutout on top between the front side serrations. The window aids in heat dissipation to keep the barrel cool during extended fire. If you have an aftermarket Mfg: Brownells