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The HK USP is a legendary handgun, but its factory light rail doesn't play nice with the flood of modern lights and lasers built for a standard Picatinny setup. That's exactly the gap this GG&G Slim Line M3/M6 Mount fills. It's a purpose-built adapter for the full-size USP that clamps over the pistol's existing light rail and converts it to a MIL-STD-1913 Picatinny interface, opening the door to the accessory you already own or the one you've been eyeing.
This is a three-piece, lightweight design that clamps onto the USP's existing rails with nothing more than a small wrench to install. It fits tightly to the trigger guard, which does two things well: it keeps zero on laser sights so your point of aim stays put, and it positions rear rocker switches where your fire control finger or off-hand thumb can hit them without repositioning your grip. That kind of intuitive switch access matters most in low light, when you don't want to be fumbling around.
GG&G machines this adapter from solid billet 6061-T6 aircraft-grade aluminum, then gives it a Type III hard-coat anodized matte black finish per mil-spec. It's tough, corrosion resistant, and light, tipping the scales right around three-quarters of an ounce, so you're not adding meaningful bulk to the pistol. It's made in the USA and backed by a lifetime warranty, which tells you how GG&G feels about it.
Fitment covers the full-size USP in 9mm, .40, and .45, and it plays well with popular lights and lasers like the Streamlight TLR-1, TLR-2, and the Insight/L3 M3 and M6 series. Owners consistently report a near-factory fit and no trouble running various TLR models. One thing worth knowing before you buy: this adapter is not designed for the SureFire X300 Ultra or Turbo, and it won't fit the USP Compact, which needs GG&G's compact version instead.
No, this version is built specifically for the full-size HK USP. GG&G makes a separate compact model for the USP Compact, so grab that one if you're running the smaller frame. This full-size adapter covers the 9mm, .40, and .45 full-size USP variants.
It converts your USP rail to standard Picatinny, so most lights and lasers built for a MIL-STD-1913 rail will attach. Popular pairings include the Streamlight TLR-1 and TLR-2 along with the Insight/L3 M3 and M6 series. Note that GG&G says the SureFire X300 Ultra and Turbo models are not compatible with this adapter.
Yes. It clamps tightly enough to the USP's existing rail to retain zero on laser sights, which is the whole point for anyone running an aiming laser. Just snug the hardware down properly during install and it stays put.
It's about as simple as pistol accessories get. The three-piece adapter clamps over the factory light rail and only needs a small wrench to tighten down. Most owners have it on and squared away in a few minutes, and it seats close enough that it looks nearly factory.
| UPC | 813157007194 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GGG-1133SP |
| Model | |
| Product Type | Mount |
| Color | Black |
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