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A microscopic look at a .22lr barrel after 50k rounds will tell you a different story. Will it still shoot? Sure. Accurately? Nope.
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FYI. I'm writing a piece on Tactical Solutions and when I talked to the guys there I specifically asked about the aluminum breech taking a beating.
If they had to estimate, the upper will withstand 50k rounds under normal use. The barrel may be shot out like any other .22LR barrel after 50K, but the durability is there.
They have an upper at the factory with 90K rounds through it.
That's direct from the TacSol guys.
50k rounds to wear out a rimfire barrel? Maybe x10.
A microscopic look at a .22lr barrel after 50k rounds will tell you a different story. Will it still shoot? Sure. Accurately? Nope.
I guess it depends on your definition of accurate. Are you using Tac Sol pistols to shoot benchrest matches? A semi auto rimfire pistol that shoots 4moa is absolutely sufficient for its intended uses. Accelerated erosion is a result of heat (hard to generate in a rimfire sufficient to matter), and the effects of leftover compounds from the cartridge in the bore being pushed through the bore by the next projectile. Some ammo is worse than others, with Eley having a bad reputation.
Rimfire benchrest shooters usually require a high level of accuracy that just doesn't matter in a semi auto rimfire pistol. A "shot out" barrel may have opened up from shooting consistent .4moa groups, to shooting .8moa groups. That's enough to make the rifle not competitive in a match.
But a semi auto pistol most likely used for recreational plinking, or at steel challenge matches? Still viable at 4MOA groups.