Tactical Supply Depot Ultra Light Castle nut.
Your Lower is made of aluminum and so is your buffer tube, Why risk stripping out your buffer tube with a steel castle nut? Our UltraLight Castle nut is Machined from aluminum as opposed to steel to give you less weight.
CAUTION, DO Not over tighten. Warranty will be void if threads are stripped.
Posted by Unknown on Jul 22nd 2016
I thought that these would just be another average castle nut but made from aluminum. However once my order arrived in a well packed clear container I could tell there was quality in the machining. The threads were all clean and the anodized finish flawless. I installed it on my buffer tube without any thread lubricant and it spun down and easily torqued up next to my end plate. This is a must have part for any project or store stock AR.