This is the same kind of texturing found on the P250 and P290RS, and while at first I thought it was some kind of some kind of mechanical etching done after the molding process, I discovered it’s actually part of the molding. It is actually far more aggressive and grippy than it looks. It may not look like much, but appearances are deceiving. There’s fine texturing on the front, back and both sides of the frame. I found the triangular mag release to be surprisingly ergonomic. The triangular magazine release is reversible, with easy-to-follow instructions in the owner’s manual. Going with the “simple is better” mantra, the SIG Sauer P320 has no controls other than an ambidextrous slide stop/release, takedown lever and magazine release. Mine was marked “Full Medium”-meaning full-size grip frame, medium size grip. Want to know which grip your pistol is equipped with? It will be marked on the right side of the frame above the accessory rail and on the butt. 357 SIG, but I can’t see anyone but police departments and SIG fanboys buying all those spare components. Technically, it is possible to switch the serialized chassis between guns chambered in 9mm. SIG offers full-size and compact grip modules with small, medium and large grip sizes. The serial number is visible through a window in the plastic on the right side of the grip. The serialized frame is actually a stainless steel chassis inside the polymer grip module. The SIG Sauer P320 is a modular gun in that the frame isn’t really a frame. For testing I received a full-size version in 9mm. Currently, SIG offers full-size and compact versions of the P320, in both 9mm and. The SIG Sauer P320 shares the grip, magazine and barrel of the P250. That’s because the new gun is basically a striker-fired version of SIG’s P250, a modular-framed double action/single action introduced several years ago. The SIG Sauer P320 might look a little familiar. The announcement of the SIG Sauer P320, ironically was what made me realize that-in an era where everybody is jumping on the striker-fired bandwagon-the company didn’t have a striker-fired pistol.