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Posted: 6/30/2015 1:00:15 PM EDT
[#1]
There is not really a one commercial spec. Even though some drawings on the net show it I know of at least four different dimension commercial tubes that only allow certain stocks to fit on them.
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Posted: 6/30/2015 1:42:26 PM EDT
[#2]
Quoted:
Just curious of who was the first manufacturer of the commercial AR receiver extension...when it came out...and why. Did they think they were making an improvement over the mil-spec RE? I wonder over the years how many AR owners have ordered the wrong size butt stock since the commercial RE became available? Don't know who or when, but why is simple. It's cheaper to make. The cross section of a commercial tube is optimized to be extruded in its final shape. All that remains is the bore the hole, clean up the bottom rib, make the slot and thread. They were/are usually 6061 because 6061 extrudes better than 7075. The "Mil-Spec" tube is made from a forging and has to have the bottom rib machined, as the corner radius is a little to sharp for extrusion, that means the outer diameter has the be cut with a profile cutter. There is some strength difference, but it's not as much as you'd think... What you have to careful of is extruded "mil-spec" tubes. These are made by taking a commercial tube extrusion in 6061, machining it down to "mil-spec" dimensions and cutting the threads (instead of rolling them in, as done on proper "mil-spec" tubes). |
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Posted: 6/30/2015 1:43:06 PM EDT
[#3]
Quoted:
Just curious of who was the first manufacturer of the commercial AR receiver extension...when it came out...and why. Did they think they were making an improvement over the mil-spec RE? They were making it cheaper, by utilizing standard pipe sizes instead of milling out a piece of aluminum they saved lots of machining time. |
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Posted: 6/30/2015 2:07:38 PM EDT
[#4]
There are always going to be companies who see the need for cheaper, easier, and quicker to make. In that same manner, there are always going to be customers who just want the cheapest items as well.
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Posted: 6/30/2015 2:08:29 PM EDT
[#5]
Quote HistoryQuoted:
They were making it cheaper, by utilizing standard pipe sizes instead of milling out a piece of aluminum they saved lots of machining time. Quote HistoryQuoted:
Quoted:
Just curious of who was the first manufacturer of the commercial AR receiver extension...when it came out...and why. Did they think they were making an improvement over the mil-spec RE? They were making it cheaper, by utilizing standard pipe sizes instead of milling out a piece of aluminum they saved lots of machining time. Making it a standard size wouldn't help much, as there is a big rib on the bottom. The diameter was driven by the 1-3/16-16 UN thread that had to be cut on the front end.... |
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Posted: 6/30/2015 2:18:02 PM EDT
[#6]
I can't remember the guys' name that made the first commercial receiver extension, but I do remember that clharr knows it.
It was made for cheaper production, due to the manufacturing process, a true MIL-SPEC extension costs more to make than a commercial extension. |
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Posted: 6/30/2015 2:53:12 PM EDT
[#7]
Wasn't it Dick Drasen that first made the commercial receiver extension back in the 80's.
Nesard and Sendra are the companies he owned, among others. |
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Posted: 6/30/2015 3:17:42 PM EDT
[#8]
As was stated above, It's a way around doing a roll thread, but still using a net shape extrusion.
Doing a full billet would be the other way to get a proper sized thread, with the correct diameter extension. |
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Posted: 6/30/2015 8:30:25 PM EDT
[#9]
Quote HistoryQuoted:
As was stated above, It's a way around doing a roll thread, but still using a net shape extrusion. Doing a full billet would be the other way to get a proper sized thread, with the correct diameter extension. A full billet would be just as expensive as a forging. What you save by not have to contract out for the forgings you would spend on the extra machining.... |
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Posted: 6/30/2015 8:43:30 PM EDT
[#10]
IIRC, it was Olympic Arms
BTW, there are respected companies like Vltor doing Mil Spec sized extruded Receiver Extensions... "Five position receiver extension made from impact extruded 7075 T6 aluminum Hard coat anodized Positions are numbered and are visible through the witness hole on most stocks Snag-free sliding of the buttstock" |
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Posted: 6/30/2015 9:07:14 PM EDT
[#11]
asked and answered, done to death
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