2011 / STI / SVI - 170mm - 13-Coil Magazine Springs by ISMI
13 coil spring for use in STI/SVI magazines up to 170mm length.
Important Warning: Modification to your firearm may nullify the manufacturers warranty. This product must be installed by a qualified gunsmith. No liability is expressed or implied for damage or injury which may result from improper installation or use of this product.