had afew 520's great little guns, yes they crack but mostly from super velocity .22 ammo with more pressure like velocitor - mine have been fine for 20 years with subsonic and
standard supersonic not the wiz bang super fast ammo. Worked in retail at a gun shop and a regular came in with his 520 is pieces, showed me the ammo used and he wasn't sure
what it was, silver casing turned out to be velocitor or stinger(some cci super fast stuff) so i would happily use mine with any standard supers or subs
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