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9/22/2017 12:11:25 AM
Posted: 5/28/2003 10:35:52 AM EDT
All this talk about the VLTOR stock only fitting genyoowine Prancing Pony tubes (because they are narrower) got me wondering; what is the diameter of the Colt tube? How about the Bushy/aftermarket tubes? Anyone have numbers?


Link Posted: 5/28/2003 6:44:11 PM EDT
Colt tube =29mm Aftermarket=30mm Just enough to keep a Colt spec stock from fitting on an aftermarket tube[;D]
Link Posted: 5/28/2003 6:55:41 PM EDT
Wonder why they're different. Colt defending a patent?
Link Posted: 5/28/2003 8:58:29 PM EDT
The reason, it's cheaper to make an aftermarket version. The Colt/Milspec receiver extension threads are 1.1875" and the tube diameter is machined down to 1.150". Back in the 1970's Jerry Drasen (of Nasard and sendra) made up a low cost/quality carbine stock assembly. What he did was to have an aluminum extrusion made that measured 1.170" in diameter. All he had to do was bore it out, thread the one end and add the detent slots. The problem is, the tube is thicker and heavier, and the threads are not complete, .0135 less per side, making the thread mounting point weaker. In other words, the Colt/milspec tubes have stronger mounting and are overall lighter. So, because of Drasen, everyone followed the leader. Call MSTN and get the Milspec tube from him. They're milspec and a lot cheaper then anyone else.
Link Posted: 5/28/2003 9:03:04 PM EDT
Yes, you need to get a Colt Carbine buffer tube to fit the Vltor. In addition, the Vltor does mention it has to be a Colt tube in order to fit the stock. Bushmaster current carbine buffer tube is on the aftermarket size.
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