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<blockquote data-quote="lazyMlazyK" data-source="post: 381540" data-attributes="member: 1697">I've got a 12 gauge 870 Express (I know, it's a cheap, CHEAP firearm - bought it in college from an acquaintance) that seems to be kind of picky on ammo.&nbsp; The action &quot;locks up&quot; after firing, mostly with cheap Winchester Super X, but also happens at times with Fiochi. Low and high brass. I've polished the chamber with Iosso and steel wool, and removed any visible burrs from manufacturing.&nbsp; I've also replaced the extractor, but that hasn't made a huge difference.&nbsp; When it locks up, I sometime have to mortar the buttstock on the ground to get the spent shell extracted.&nbsp; I have had no problems yet this year with Federal Upland low-brass, but would like to be able to run cheaper ammo (I miss alot of doves, but have fun trying).Being a Super Mag, I like that it's got the capability of firing 3-1/2&quot; shells for geese at times, but I'm about at my witts end with the damn thing locking up on me.&nbsp; I subscribe to the idea that a cheap pump should be able to reliably cycle any ammo, cheap or expensive - maybe I'm wrong in that belief?&nbsp; I'm about to look up shotgun chamber specs and start taking measurements.&nbsp; Maybe mine's a bit tight?Yes, I've already taken it to a gunsmith, they polished the chamber and that was it.</blockquote>

[QUOTE="lazyMlazyK, post: 381540, member: 1697"] I've got a 12 gauge 870 Express (I know, it's a cheap, CHEAP firearm - bought it in college from an acquaintance) that seems to be kind of picky on ammo. The action "locks up" after firing, mostly with cheap Winchester Super X, but also happens at times with Fiochi. Low and high brass. I've polished the chamber with Iosso and steel wool, and removed any visible burrs from manufacturing. I've also replaced the extractor, but that hasn't made a huge difference. When it locks up, I sometime have to mortar the buttstock on the ground to get the spent shell extracted. I have had no problems yet this year with Federal Upland low-brass, but would like to be able to run cheaper ammo (I miss alot of doves, but have fun trying). Being a Super Mag, I like that it's got the capability of firing 3-1/2" shells for geese at times, but I'm about at my witts end with the damn thing locking up on me. I subscribe to the idea that a cheap pump should be able to reliably cycle any ammo, cheap or expensive - maybe I'm wrong in that belief? I'm about to look up shotgun chamber specs and start taking measurements. Maybe mine's a bit tight? Yes, I've already taken it to a gunsmith, they polished the chamber and that was it. [/QUOTE]

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