Utilizing the ubiquitous STANAG magazine used in the AR-15/M16, the 805s action is housed in a one-piece aluminum upper receiver with a monolithic Picatinny rail. At the rear of the action is a multipurpose mounting point, fit from the factory with a single-point sling attachment. The addition of our accessory arm brace adapter coupled with the effective factory-equipped two-port brake makes the Bren impressively stable to shoot in pistol form. It shares the same low-profile sights as our Scorpion, an adjustable aperture rear and post front. The CZ 805 Bren PS1 Pistol is legally classified by the ATF as a pistol, and is intended by CZ-USA to be used as a pistol. Under current federal law and ATF policy attaching a stock to this pistol constitutes the making of a short-barreled rifle which requires registration with ATF and the payment of the applicable tax. Users of the CZ 805 Bren PS1 Pistol bear the sole responsibility for ensuring their use of the firearm complies with all local, state, and federal firearms laws.