Imagine a Tactical .22 carbine that will feed pretty much whatever rounds you throw in it. If it seems far fetched then you must have some trigger time of similar .22s that will occasionally jam and bobble unless fed a high impulse round like CCI Mini Mags, which are more expensive. The Sig 522 achieved amazing reliability in the Nutnfancy testing regime with several brands and types of rounds...not one jam in over 2000 rounds fired! And most of those rounds were low quality Federal WalMart HP ammo that gives my other tested guns fits...including the CMMG AR-15 conversion. This ability to take regular quality .22 ammo makes the 522 very cheap to shoot. This stellar reliability is contained within an original and cool rifle design that mimics the Sig 550/556 Classic lines and is often mistaken as such (the fake gas block adjustment is another nice touch). Its forend is trim and ergonomic and can be accessorized with useful railing for light and VG attachment (highly recommended for tactical practice). The barrel profile is perfect for a .22 and is topped off by a standard AR-15 threaded flash suppressor...outstanding. This means the Sig 522 can readily accept a suppressor. The receive is stout, milled from 7075 aluminum and when mated with the precision bolt is one reason the gun is so reliable: the bolt rides precisely in a milled aluminum channel. This aluminum receiver should prove to be durable in the attachment of optics and wear and tear. The lower receive is polymer ...