The World’s Fastest Magwell Is Finally Available for Your Glock Gen 4. The Ice Magwell is the fastest, easiest, most consistent magwell for IPSC competition. And now it’s available for Glock Gen 4. When you beat up the insert, the magwell is untouched. Go ahead and pop in a new insert. It takes seconds and you will have it looking and functioning like a new magwell again. Silver. Aluminum. Will work for the following models: G17, G17L, G22, G37, G31, G34, G24 and G35