4th round FTF

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4th round FTF

Post by John McCormick on 3/1/2018, 1:47 pm

Shooting my 1911 today, slide mounted U/D, 200 gr Lead SWC and 3.8 gr WST, 10lb recoil spring, three different MecGar magazines. Ejection and feeding seemed positive but almost without exception, in 100 rds fired, five per magazine, I would get a FTE/FTF on the fourth round fired. The fourth would fail to clear the gun and the fifth would fail to chamber. Grip weakening towards the end of each string, maybe? Any other ideas?

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Re: 4th round FTF

Post by spursnguns on 3/1/2018, 1:57 pm

Hello John,

What does "failure to chamber" mean....Jams?  Partially chambered?  Sitting on top of follower and slide locked back?

Pictures would be helpful.

Thanks.

Jim
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Re: 4th round FTF

Post by james r chapman on 3/1/2018, 2:23 pm

I would guess 4th round would have to be magazine spring
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Re: 4th round FTF

Post by jglenn21 on 3/1/2018, 2:31 pm

check you extractor tension for being too light.


what lb springs are you running in your mags>?
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Re: 4th round FTF

Post by zanemoseley on 3/1/2018, 3:07 pm

I had the exact problem, it was due to the extractor not being tuned properly after I replaced it. I thought it was magazines for a while and even installed Wolff extra strength springs. I tried tweaking the extractor myself but ended up sending it to Jon, its worked like a champ since.

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Re: 4th round FTF

Post by james r chapman on 3/1/2018, 3:56 pm

interesting, I wonder why?
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Re: 4th round FTF

Post by zanemoseley on 3/1/2018, 4:23 pm

I think when the magazine gets low the spring pressure drop by the last round and it is less likely to overcome am out of tune extractor. When the magazine is full it has loads of spring pressure to help out.

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Re: 4th round FTF

Post by jglenn21 on 3/1/2018, 4:31 pm

if the extractor fails to hold the case on extraction it can slip loose and miss or miss hit the ejector....  magazine pressure or lack there of  also comes into play sometimes as Zane noted.


I fool with enough 1911s I end up using the Weigand tensioning tools and measuring gauges to be consistent  across all my 1911s..it has shown to be pretty reliable

Jerry Keefer had some great threads on the extractor here and elsewhere
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Re: 4th round FTF

Post by John McCormick on 3/2/2018, 7:54 am

I'll check the extractor tension. And I'm going to try something I should have done right there and then: load more than five rounds and see if it still happens after firing the next-to-last round. I'll bring my Wilson magazines along, too.

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