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Downloading USP 40 mags?

3093 Views 13 Replies 8 Participants Last post by  OfcrJosh462
I went shooting yesterday and brought my USP 40 LEM full size duty weapon. I had approx. 3 failure to feeds on the last round of my magazines.... the mags are the ones I carry on duty and have the Lone Wolf + mag springs installed. Now I'm wondering, should I download 1 round in all my duty mags to help stop this from happening? What would cause a last round ftf with the stronger mag springs? Dirty ammo? I know the gun was pristine when I started but we were shooting Tn Cartridge Co. reloads....

Any help fellas?
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· Registered
3,852 Posts

If it always only happens on the last rounds in the mag, it is extremely likely to be mag-springs.

If you are using 13-round mags, the HK mag-spring part# is 214212, and the Wolff Gunsprings +10% mag-spring part# is 78571.

If you are using 10-round mags, the HK mag-spring part# is 214850, and the Wolff Gunsprings +10% mag-spring part# is 78671.

Wolff magazine springs available factory-direct at :)
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