Products You May Like

EGW Ignition Kit w/ Lightened Hammer Blue (Without Colt Sear Spring) $0.00 Click to view
O/S Firing Pin 1911 .066 $10.00
1-pc SS 5" Guide Rod w/ Hole $30.00
Monogrammed Spring Plug - SS - "O" $10.00
Monogrammed Spring Plug - SS - "M" $10.00
Monogrammed Spring Plug - Blue - "Marine Corps Outline" $10.00
Mainspring (Hammer) ISMI 19 lb
Click to enlarge

Mainspring (Hammer) ISMI 19 lb

Product #: 10641
Price: $6.49


In Stock
E-mail to a friend


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.

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

Product Reviews

Login or Register to write the first review.