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ISMI 1911 Mainspring (Hammer) 17 lb Reviews

5 Rating 32 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:

52 BELMONT AVE,
QUAKERTOWN
Pennsylvania
18951

It’s a spring!
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Posted 5 months ago
Installed the 17Lb spring No more light primer strikes Aweome service Ty
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Posted 6 months ago
Great product ! Works as expected
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Posted 8 months ago
Came in very quickly and functioned flawlessly with zero light primer strikes. If you are thinking about dropping down to 17lb’s I highly recommend pulling the trigger…literally!
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Posted 1 year ago
Dropped right into my prodigy frame and did what I needed it to.
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Posted 1 year ago
Fast delivery, Good product and fit and worked as described.
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Posted 1 year ago
Author didn't leave any comments.
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Posted 1 year ago
This is my go-to for 1911s, in combination with an extended firing pin as insurance against light strikes. Works perfectly in every gun I’ve installed it in.
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Posted 1 year ago