Searching for barrel for S&W mod. 645.
suggested by gunsmith.

What's the symptoms of the problem? "Jamming" is too vague.


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Jamming?

Feeding stoppage? Extraction and/or ejection problems?

A good place to start diagnosing is to reflect upon the age of the recoil and mag springs, and if that doesn't resolve the problem, then inspect the extractor hook. The extractors are fitted parts, and the extractor springs could vary, depending on the tension checked by a force dial gauge.

Also, it might not hurt to transition to the revised and improved current 8-rd 4506 mags, which had better followers and mag bodies (feed lips).

If your recoil spring and mag springs are more than 5 years old, it's probably about time for new ones.

FWIW:

__________________
Ret LE Firearms inst & armorer

Ejection after fireing maybe three rounds. The empty seems to be catching on the next shell feeding in. The ejecter and spring have been replaced. Tried new magazine from midway USA. Gunsmith thinks someone used a dremmel on the feed.

The ejector or the extractor was replaced?

Extractors are usually fitted parts, and can especially be so on the early .45's. A bit more "generous" tolerances and manufacturing which included hand-controlled equipment in those days. Extractor fit (meaning filing on the adjustment pad) is checked with a bar gauge nowadays (Go/No-Go ends, and a $70 tool made for S&W for each caliber and sold to armorers).

The spring tension is checked with a force dial gauge ($150 tool made by Wagner), and if it's too light you get failures-to-extract/eject, and too heavy you get failures-to-feed. Depending on the depth of the spring's hole (done on equipment controlled by hand in those days), the tension for the same spring might vary from one gun to the next. Ditto the shape of the bottom of the hole (if dulling cutter used, for example).

A heavier than standard spring (there are 2 of those, last I looked, Heavy & Extra-Heavy) might be needed to put the tension up in the normal range, if the spring tension is too low. The normal extractor spring tension range, measured on the force dial tool, runs 5 - 6 1/2 lbs for the .45's. (Also, some older .45 extractors could also have an adjustment pad on the tail, to file if the tension was too heavy.)

If the empty case is being dropped before it can reach the ejector, I'd check the extractor spring's tension and the hook's reach, just to make sure they're both within spec.

If your smith has the right tools, and is familiar with the 645's, it's easy enough to check.

A short/weakened recoil spring can also make for some puzzling extraction/ejection issues, too, so it's wise to check it so you're not chasing some other "cause" without success.

Just some thoughts, since I obviously can't know what's happening with your 645, not being there to actually look at it.

Also, if you're using an actual 645 magazine, and the 'next round' is moving at all when this problem occurs, I'd try a new-style 4506 mag, with a known good spring (just to try and eliminate a potential mag lip/spec issue having an influence).

__________________
Ret LE Firearms inst & armorer

Thanks for the very good information.