Add rounds with out sacrificing your extension tube strength. All our tubes are male threaded on one end and female threaded on the other so that you can nest tubes into one another.
Our springs are made to our specifications out of 17-4 stainless steel so you won’t have to worry about changing that spring all too often.
DISCLAIMER: *All tubes except the +1 option come with a spring
**Only Aluminum tubes are threaded to same spec on both sides; otherwise, yes, carbon fiber tubes (on this page) do thread together with our aluminum tubes and our shotgun nuts for the ultimate modular set up!