The Ghost Turbo Maritime Cups (TMC) are the only Maritime Cups Available that will make your Glock the most reliable by permitting the firing pin to bypass water, oil or debris better than ever thru the firing pin channel. This is done by creating voids for the fluids or debris to pass through. This feature insures reliable firing even under water! The Ghost Turbo Maritime Turbo Cups also lessen the friction in the Glock firing pin channel. You can now confidently shoot your Glock to the extreme!DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.