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ISMI 1911 Mainspring (Hammer) 17 lb Reviews

4.9 Rating 55 Reviews
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Available in 17lb or 19lb. All ISMI Springs are made from silicone chrome instead of 150 year old music wire. Every ISMI spring is heat treated, shot peened & stress relieved to enhance durability, consistency and reliability. ISMI is a contractor of the U.S. government and produces springs used in machine guns with incredibly high cycling rates. Also, the creator of ISMI springs obtained his knowledge from extensive research in the development of springs used in Indy car racing. In independent testing, ISMI spring have endured in excess of 100,000 compression cycles. We don’t recommend going that long between changes however. With an ISMI spring, practice routine maintenance and change it once a year.
Warning: This product may be alloyed with trace amounts of lead and other elements which are known to the State of California to cause reproductive harm and cancer. To prevent exposure, do not alter the product by welding, grinding, etc. For more information, go to www.P65Warnings.ca.gov.

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Location:

1121A Richland Commerce Dr,
QUAKERTOWN
Pennsylvania
18951

“I always switch to 17# main spring in all my 1911 and 2011's and keep my fingers crossed I don't have any light primer strikes. So far they've been 100% in about 15 different guns. I have a spring gauge and some springs are not even close to what they are sold as, I never have this problem with ISMI.”
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Posted 1 month ago
“These still giver perfectly reliable ignition even with my reloads! Love these parts to rebuild my Foreign made 1911s to have a better trigger. I have a Tisas and a Gersan that came with 6-7# triggers. These parts from EGW are the key to getting them down to a crisp 4#!”
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Posted 1 month ago
“Lightens the trigger, but still offers reliable ignition. Just right for my 45 acp 1911.”
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Posted 2 months ago
“Great Item, large selection of springs to choose from.”
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Posted 2 months ago
Author didn't leave any comments.
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Posted 2 months ago
“Very easy to install.”
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Posted 3 months ago
Author didn't leave any comments.
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Posted 3 months ago
“All EGW products are excellent! Thanks!”
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Posted 4 months ago