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Posted: 12/20/2003 9:49:09 AM EDT
[#1]
Hmmmm, I'm forced to admit that I don't know what a receiver extension is...Where is it on an AR-15??? Anywhere near the buffer tube???
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Posted: 12/20/2003 9:53:25 AM EDT
[#2]
Receiver extension...buffer tube...same same.
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Posted: 12/20/2003 10:29:44 AM EDT
[#3]
Where do you see two types listed for sale?
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Posted: 12/20/2003 10:35:15 AM EDT
[#4]
[url]http://www.sawlesales.com/[/url]
SA61574E 01 BUTTSTOCK, RECEIVER EXTENSION - RIFLE (BUFFER TUBE), EXTRUDED 35.00 SP61574 01 BUTTSTOCK, RECEIVER EXTENSION - RIFLE (BUFFER TUBE), FORGED 65.00 |
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Posted: 12/20/2003 10:41:30 AM EDT
[#5]
[url]https://secure.valinet.com/~yankeeh/cgi-bin/web_store/web_store.cgi?page=products.html&&cart_id=6486442_3379[/url]
RECEIVER EXTENSION YHM-8581: MILITARY - Precision machined from solid 7075-t6 aircraft quality aluminum, then hard coated and dry film lubricated to mil. specs. YHM-8581 Qty: Price: $23.50 YHM-8581H: COMMERCIAL - Precision machined to the same specifications as our military model, but excludes the dry film lubricant. YHM-8581H Qty: Price: $20.80 YHM-8581C: COMMERCIAL ANODIZE - THE SAME AS OUR MILITARY MODEL BUT WITH A COMMERCIAL ANODIZE AND NO DRY FILM LUBRICANT. YHM-8581C Qty: Price: $17.25 YHM-8581W: COMMERCIAL IN THE WHITE - The same as our military model but without any anodizing and no dry film lubricant. YHM-8581W Qty: Price: $16.25 |
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Posted: 12/20/2003 4:28:59 PM EDT
[#6]
This thread covers the difference between castings, forgings, and extrusions.
[url]www.ar15.com/forums/topic.html?b=3&f=118&t=164318[/url] An extrusion is when material is forced through a die under pressure. Think about that Play-Doh factory you had as a kid that you can squeeze out Play-Doh in different shapes, or a pasta-maker. [img]store4.yimg.com/I/creativetoy_1770_14925788[/img] In an extrusion, the center tends to be dense, but the outer edges often have voids, as there was less pressure there. [img]www.nwaluminum.com/Puck2.jpg[/img] A forging will be consistant all the way through, because a huge hammer pounded on the metal until the grain structure was very evenly compacted. [img]www.nwaluminum.com/Puck1.jpg[/img] As you can imagine, the tighter the grain structure, the stronger the metal is and the less likely it is to crack and break. A forged part generally requires a lot more machining time, making it more expensive to produce, but will also give you a superior product. Castings and extrusions are used when the cost of an item is more important and the strength requirements are lower. -Troy |
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Posted: 12/20/2003 5:17:15 PM EDT
[#7]
Hmmmmmmmm. Never heard of a forged buffer tube before. Must be a new way to separate people from their cash. $65.00 for a (forged) buffer tube is outrageous!
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Posted: 12/20/2003 5:34:44 PM EDT
[#8]
Quoted: Receiver extension...buffer tube...same same. That being the case, I would guess that a tube/extension with *any* seam would be forged...since the extrusion wouldn't leave a seam...But just a WAG...(It may be machined afterward)... |
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Posted: 12/20/2003 6:14:57 PM EDT
[#9]
IIRC, the Colt carbine (collapsable) buffer tube is a forged part, and the VLTOR (which is much less expensive) is a casting.
I have got to believe that the buffer tube on an AR15 is a high stress part (think leverage + buttstroke to the BG's head). Troy, do you have any opinion of the Colt v. VLTOR extensions? Thanks, Corey |
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Posted: 12/20/2003 6:52:50 PM EDT
[#10]
I don't have any experience with them, and I don't know them to be castings or otherwise. I wouldn't feel too comfortable with a casting, though.
-Troy |
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Posted: 12/21/2003 7:39:52 AM EDT
[#11]
Quoted: IIRC, the Colt carbine (collapsable) buffer tube is a forged part, and the VLTOR (which is much less expensive) is a casting. Corey The Vltor is machined from an extrusion. I must say the pics of the forged vs. extruded rod may be misleading, as post-extrusion heat treating will generally improve grain structure dramatically. Immediately after extrusion, the alloy is soft and must be tempered to the proper hardness. |
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Posted: 12/21/2003 2:20:38 PM EDT
[#12]
I was excited for a second at $23.00 they would be half the cost of Vltor (then I found out these are A2 reciever extensions) not Colt, spec CAR.
I have had both Colt and Vltor reciever extensions and I could not tell a difference, both are solid quality parts, the Vltor may have a smoother external finish, and it does have the 5th position. I replaced my Colt's with Vltors. (The 5th pos gives me a lot more flexibility.) [b]What is really interesting is [url]https://secure.valinet.com/~yankeeh/cgi-bin/web_store/web_store.cgi?page=forearm.html&&cart_id=6486442_3379[/url] They claim that fixing the forend to the barrel greatly increases reliability. (How is that possible?)[/b] |
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Posted: 12/21/2003 5:36:24 PM EDT
[#13]
Quoted: Quoted: IIRC, the Colt carbine (collapsable) buffer tube is a forged part, and the VLTOR (which is much less expensive) is a casting. Corey The Vltor is machined from an extrusion. I must say the pics of the forged vs. extruded rod may be misleading, as post-extrusion heat treating will generally improve grain structure dramatically. Immediately after extrusion, the alloy is soft and must be tempered to the proper hardness. Thanks for clarifying! Would the VLTOR be as strong as the Colt? I'm extremely interested in the VLTOR (particularly after the 9/14/04), but would spend the extra money on the Colt if it were a stronger part. Thanks again, Corey |
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