This base-model P220 is enhanced with aftermarket tritium sights. The SIG SAUER P220 is a popular .45 ACP handgun. It also comes in P220R and P220ST versions. The base and R models have an alloy frame with a blued steel slide; the ST model has a stainless steel frame and slide. The R and ST models also have an accessory rail along the top of the frame, beneath the slide and barrel, allowing fitting of accessories such as tactical lights or laser aiming aids.
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