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ISMI 12.5 lb recoil spring For Govt. Model


Putty

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You have to check the ISMI 12.5lb. for coil bind when you install it. The compressed length is longer than other similar springs.

I used to have to cut 4 coils off this spring, until I modified the recoil plug to accept the length.

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In my Viper, Wolff and ISMI recoil springs both quickly took a set and became unusable. I killed Wolffs in around 1000-1500 rounds. I killed a couple of ISMIs in < 1000 rounds each. These were 12lb variable Wolffs, and 12.5lb ISMIs.

Matt Burkett turned me onto the Sprinco springs - I had a 12lb in the gun for around 12K+ rounds w/ no signs of loss of spring pressure. Damn fine part.

ISMI springs worked *great* in my mags, though....

Dave

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i've tested wolff springs after thousands of rounds and found them within a half pound or less of original weight.

Dan - how long have you been actively testing Wolff springs?? A while back (say, 5+ years ago), it seemed like they were somewhat inconsistent, and seemed to die quickly in some folks' guns (their lifetime seemed to be a mixed bag - some lasted longer than others, etc). Perhaps they've improved quality since then, or something?

I didn't do extensive testing over a bunch of springs - just shot through 3 (I think?) Wolff springs, 1 ISMI, and 1 Sprinco in my gun.... and talked to a bunch of people about them at the time. Once I found what worked for me, it seemed pointless to keep playing around :) :) :)

Dave

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i think the consistency of springs comes and goes from all the spring manufacturers. but i have found wolff to be the most consistent. i just took a 9# spring out of one of my open guns and checked it, it measured almost exactly 9# and it has been in that gun for at least a year or more.

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