The LANTAC Guide Rod Adapter Bushing has an ultra smooth bore and a crenulated crown which reduces friction performance and gives an aggressive styling. The Bushing has a recessed spring capture area which allows for simple assembly when sliding on to the LANTAC Guide Rod. The LANTAC Guide Rod Adapter Bushing is an excellent accessory for your Glock Gen4 and is very effective in conjunction with the LANTAC Guide Rod and Ultimate Spring Kit. Constructed from precision 17-4PH stainless steel.