I really doubt you'll wear out a barrel, so a spare barrel is not needed. The smaller parts and springs are more likely to fail. I do have a few spare .40 S&W barrels for my .357 SIG guns, but that's a little different than what you're asking.
What they both said.
The only "spare" barrels I have lying around are different calibers.
If you're needing to replace barrels often, then you either have a copious amount of expendable ammo in which case we should be friends, or it's you and not the barrel
Bulljack, other than what GBIA touched on, unless you have an endless source of free steel jacketed ammunition, or corrosively primed ammunition, that you can't refuse, you should be all right! But, hey!!! for free ammo, another barrel would be paid for in about 1k rounds... just saying!
My MK25 doesn't see a lot of action since it's an EDC CCW. Although, I do bring it to the range on occasions for some drills and practice time, but ammo spent during these sessions are close to 200-300 rds FMJ 124gr and sometimes 147gr. No +P ammos used. Ammos are expensive here, more than a dollar a piece! So a 300 round range session would mean that I would spend close to $300 for ammo.
I don't abuse my gun and I spend adequate time for cleaning and maintenance.
Spare parts are hard to come by here and for a barrel to appear in the market is a rare thing. One came up but the price is relatively high, about $600. Having some thoughts in getting it but I opted to ask you guys first if it's really a must to get a spare barrel.
Thanks for your inputs, it helped a lot for my decision. I'll pass on it.
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