jtallen83 Posted July 1, 2018 Report Share Posted July 1, 2018 So I'm trying to build a pistol with a Sig P716 12.5 inch barrel. My measurements from the gas port tell me I need a 10 7/8 inch long gas tube to make this work and I have not seen anything close except a reference to an Armalite super SASS carbine length tube at 11 inches. I'm afraid the 11 3/4 inch for a mid-length will be too much. If anyone has a source for something close to this odd length tube please let me know. Push comes to shove I'll just have a spare barrel for my 716. On a side note the port in this barrel is .071, might help explain why my 716 has symptoms of being under gassed. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 1, 2018 Report Share Posted July 1, 2018 White Oak Armament, brother. You'll have to call them. 309-376-2288 Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 1, 2018 Author Report Share Posted July 1, 2018 (edited) 9 minutes ago, 98Z5V said: White Oak Armament, brother. You'll have to call them. 309-376-2288 I was just looking at their gas tube page thinking someone has to be custom making some of the lengths they sell, they will get a call Monday. Hope they can help, too nice and too cheap a barrel to give up on. The shoulder at the gas block is way off but the dimple jig makes gas block alignment foolproof. If they can make it I may have them make a few and then grab more of those $79.99 Sig barrels. Edited July 1, 2018 by jtallen83 Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 1, 2018 Author Report Share Posted July 1, 2018 (edited) @98Z5V I used the center of the cam pin cut out in the upper to determine the 10 7/8 inch length, that should get me what I want won't it? Would I be better fudging a little to the short side then opening up the port if I need more gas? I don't want to custom order a tube only to have the tube bottom out in the carrier key. Edited July 1, 2018 by jtallen83 Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 1, 2018 Report Share Posted July 1, 2018 (edited) 4 minutes ago, jtallen83 said: @98Z5V I used the center of the cam pin cut out in the upper to determine the 10 7/8 inch length, that should get me what I want won't it? That'll be perfect. From center of cam pin cutout, forward to gas port hole in barrel. + one more dimension. Pick up a standard gas tube off anything, and determine how much longer a gas tube is to it's end, after it's gas port. Those two numbers together will give you an exact length measurement that will work like a champ. Hold on - I have one right here - measurement coming right up. That additional length,from gas port in the gas tube to the end of the gas tube is 0.600". Add that to the distance of: center of cam pin cutout to center of gas port in barrel, and you'll have it perfect. Edited July 1, 2018 by 98Z5V Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 2, 2018 Author Report Share Posted July 2, 2018 Gas tube ordered, went with 11 inches after a little more precise measurement. $35 from White Oak Armament, expensive for a tube but with the price of the barrel being so cheap I am still ahead, as long as this works! Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 2, 2018 Author Report Share Posted July 2, 2018 These guys are fast! ordered at about 1000. Got a call to confirm the order about 1330, very good customer service, he went over exactly how I got the measurements and what I was building so he would be on the same page. At 1545 I got the tracking number! I may just get to mock this thing up before heading back to work. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 2, 2018 Report Share Posted July 2, 2018 That's very damn awesome, right there. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted July 5, 2018 Author Report Share Posted July 5, 2018 Gas tube is a perfect fit, dead center of the cutout. Just ordered the Aero 9 inch rail, hopefully the tube makes it past. Had bought a cheap rail local but the barrel nut blocked the tube from passing into the upper, had a spare nut from a MI rail and the tube just barely made it in, as long as the Aero nut doesn’t have any more meat than it I will be good. Next trip home I will start a build thread, CDNN still has a pile of those 12.5 inch barrels, with the SB3 “brace” you can make a nice 308 pistol about as close to a SBR as a guy can get. Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 5, 2018 Report Share Posted July 5, 2018 NICE!!! I love it when a plan comes together... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.