Recently bought used M439 (made in '87 - has long extractor and ambi safety) - I cleaned it pre-shooting. Shot it first time with daughter and son-in-law. I shot 8 rounds, they each shot about 42 rounds - all ammo was WIN white box. We used an original S&W mag and a stainless aftermarket, unknown mfgr. Three times (son-in-law) had FTE - twice with stainless mag, once with S&W mag.
Each time, slide was still back, top round in mag partially forward (about 1/4 inch), fired round still in chamber, so new round could not load and slide could not close. I locked slide back, pushed top round back in mag (so mag could be removed), released slide, then hand racked and fired round ejected.
I wondered if maybe the extractor was not grabbing / holding the rim - that seems likely, since fired case still in chamber and slide had cycled enuf to partially strip top round. If so, ? is why - ammo ?, worn extractor ?, shooter ?.
Second issue (less important) - racking by hand with empty mag, slide does lock back (using above 2 mags plus other four). While shooting, twice with the stainless mag, slide did not lock back. That's more of a nuisance than safety issue.
Any advice / suggestions much appreciated.
Thanks in advance.
Each time, slide was still back, top round in mag partially forward (about 1/4 inch), fired round still in chamber, so new round could not load and slide could not close. I locked slide back, pushed top round back in mag (so mag could be removed), released slide, then hand racked and fired round ejected.
I wondered if maybe the extractor was not grabbing / holding the rim - that seems likely, since fired case still in chamber and slide had cycled enuf to partially strip top round. If so, ? is why - ammo ?, worn extractor ?, shooter ?.
Second issue (less important) - racking by hand with empty mag, slide does lock back (using above 2 mags plus other four). While shooting, twice with the stainless mag, slide did not lock back. That's more of a nuisance than safety issue.
Any advice / suggestions much appreciated.
Thanks in advance.