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38 Posts
Discussion Starter · #1 ·
Need some help here on this forum. Involves a custom bobtail in .40.
Using (4) Metlaform 1911 mags in .40/357 Sig purchased new from Brownells and factory ammo.

Only one mag functioned without failure; two would not feed any rounds becasue they would not let the slide go into battery; and the fourth functioned intermittantly through one magazine of bullets. :scratch:

Thoughts on possible fixes?

Recoil spring change out? If so,what poundage?

Try different brand of ammo?

Extractor tuning?

Any constructive thoughts appreciated.

Thanks in advance.

Premium Member
15,610 Posts
The rail is hitting the mag in the back, the notch needs to be filed deeper to clear the disco rail. And/or the tops of the lips are hitting.

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