Good for increasing the overall length of ar pistols when needed - Spikes Tactical Pistol Buffer Tube w/ Step and QD Socket

I bought this for my 10.5" .300 Blackout AR pistol and overall I'm very pleased with it. Here are some details I was looking for but unable to find prior to getting it in hand. It is approximately 2" longer than a standard buffer tube. When installed it measures 8⅝" from the rear of the lower receiver to the end of the buffer tube, and measures 8⅛" from the castle nut to the end of the tube. It measures 6⅜" from the back end to the shoulder. My SB Tactical SBM4 brace hangs about ⅞" off the back of the tube when slid over the tube right up to the shoulder. The fit is slightly loose but if you push it over the shoulder so that the back of the brace is flush with the back of the buffer tube it snugs up very nicely. Prior to installing this buffer tube my .300 Blackout AR pistol had an overall length of approximately 24¾" measured from the end of the buffer tube to the end of the muzzle (without a muzzle device installed). After installing this buffer tube it now has an overall length of 26¾" from the end of the buffer tube to the end of the muzzle.