Mag springs can be had for $9, and a few cents less with Wolff replacements. Not sure where you are buying your $$$$ replacements.
Mags on the other hand, are fairly expensive for the USP .45 ($60), but the smaller calibers are less.
As far as reliability/durability, the Mark 23 (USP's big brother) passed US SCOOM testing exceeding a service life of 30,000 rounds of +P ammo, was tested in all conditions (temp, weather etc.) and exceeded the minimum mean rounds between stoppages required by the gov't.
My USP .45 has been reliable for the last 12 years with all types of ammo.
Mags on the other hand, are fairly expensive for the USP .45 ($60), but the smaller calibers are less.
As far as reliability/durability, the Mark 23 (USP's big brother) passed US SCOOM testing exceeding a service life of 30,000 rounds of +P ammo, was tested in all conditions (temp, weather etc.) and exceeded the minimum mean rounds between stoppages required by the gov't.
My USP .45 has been reliable for the last 12 years with all types of ammo.
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