It's a semi-pistol grip in the states. You will hear, of course, how a 'true' POW is more slender and graceful, etc... It's all balony. It's either a staight stock, a full pistol (Perazzi, 525, etc), or something in between and 'semi' covers that well. We don't need Prince of Wales, Duke of Earl, or Larry the Cable Guy.

"The price of good shotgunnery is constant practice" - Fred Kimble