M-Lok Exterior Weight Set (2 weights with hardware) Color:Black Designed for use with ISMI

Designed for use with ISMI G17 flatwire springs

This 13coil spring is meant for use in STI/SVI magazines up to 170mm

0″ barrels

For use in 30rd AR-15 magazines

M-Lok Exterior Weight Set (2 weights with hardware) Color:Black Designed for use with ISMIExternal Forend Weights by ISMI Spring Sales are designed for M Lok chassis and forends. They're perfect for achieving the perfect balance in your shooting. Unlike other weights on the market, you can stack them to achieve your perfect balance when space is limited. Individual weights are 6. 72 ounces. Sold as a pair including M Lok hardware. Long screws for stacking will be included with purchase of 2 or more sets.