Bought the back strap as the standard PX4 comes with the medium and large one. I noticed, after trying that the medium fits me marginally better(I wear size 9 European gloves). Basically I could live with either but decided on the medium after trying both, as I had no way of knowing without trying. Practically this backstrap makes the grip of the PX4 very simmilar to the Vertec grips of the 92-strainght without the back hump so it is suited for smaller hands. Quality is excellent as always from Beretta. So, if you feel that the medium is a tad to big for you, my recommendation is to go for the small one and try it.
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