The PSP feels a little slimmer and lower due to the absent trigger guard mag release and lower profile sights. On paper they're virtually identical in size, but most say the PSP is easier (or feels easier anyway) to conceal than the M8.
This was posted some time ago by another HKPro member.
PSP - Early 9mm version labled PSP on slide & checkered grips. Also chambered in .45acp. P7 - Labeled P7 on the stippled grip with protruding heel mag release, 9mm x 19 on slide. This is also commonly referred to as the P7PSP but the slide or grip is not marked so. P7E- Same as P7 but with flush heel mag release. This is also commonly referred to as the P7PSP but the slide or grip is not marked so. P7PSP - Last production run of the P7E in 1997, labled P7PSP on the slide and P7 on the grips. These came with a lifetime warranty unlike any of the previous heel mag release guns. Looks the same as the P7E. P7M8 - Labeled P7M8 on slide & grips with grip frame mag release behind trigger, 9mm. Also had a commemorative version of 500 guns in 2004. P7M13 - Same as P7M8 but labeled P7M13 and 13 round capacity. P7K3 - Labeled P7K3 on slide & grips, interchangeable in .22LR, .32ACP, & .380ACP calibers. P7M10 - Labeled P7M10 on the slide & grips, holds 10 rounds of .40S&W and has a taller slide.
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