The SLR Rifleworks G17 Extended Mag Spring is for both GLOCK® OEM G17 17rd and Magpul GL17 mag bodies. Designed to be  paired with their respective SLR Rifleworks +5 mag extensions. This high performance magazine spring has 12.5 coils, 10% extra power, and is optimized for reliability with the SLR +5 extensions, linked below.

For the OEM G17 Mag Extension click here. For the Magpul G17 Mag Extension click here.

Note: Not compatible with 10-round mag bodies.