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Posted: 10/17/2004 7:59:56 PM EDT
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I'm thinking of getting an MT6400C and making it into an SBR. I'm looking at what it will cost to do so, and have the barrel worked out. What I'm uncertain about is the stock. Must I replace the whole stock assembly, or can I unpin the stock? In other words, how much of the fixed stock assembly is salvageable? For cost purposes, I would prefer to keep as much of the old assembly as possible. I assume that this has been covered previously, but I haven't found the thread. |
I checked with Specialized Armament today on the stock question and I have an answer. Tina Elmore advised me:
So, it would appear that one wanting to upgrade the MT6400C's fixed stock would have to get a new buffer tube (receiver extension) and stock. Some parts, at least, are reusable. |
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Not necessarily so... look for thread here It really depends on how cheep you are. I did one by using the plunger and spring assembly from an old stock to fix the lever. Its on a vltor tube now. If you have access to a mill then the receiver extension can be done better. I did the one shown and it will work but a receiver extension doesnt cost much. I'm out 35.00 for the Vltor receiver extension and I already had the lever parts. Thats really all you need. |
Wow. I'm speechless. +1 |
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Yeah, it works very well. To save most of the trouble, buy a LMT or Vltor tube and just unscrew the hex nut in the lever (it could be locktited) and then just drill the roll pins out ( they are shallow) Then buy a stock lever plunger/spring assembly and you've got a Colt milspec stock! |
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You can do the tube yourself but I suggest that you buy one. I think VLTOR is the best. Here is what the stock looks like. The two holes on the side are all that gives this away.  This is a VLTOR tube. I would suggest it. Its very good quality. I picked this one up on the EE.  |
Where can one get a stock lever plunger/spring assembly? |
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Just wanted to let you know.... DO NOT use a drill to drill the pins or you will end up with a messed up looking stock. I just took one of the Colt milspect stocks apart last night and it can be done simply. Use a punch and knock the roll pins farther into the stock tube. The holes are actualy deeper then the roll pin is long. Dont be affraid to hit it hard... Once you get the pins in far enough , they may be slightly mushroomed but you can still get the stock off the tube. the one I did you can barely see the holes since it wasnt done with a drill.. The bad thing about the drill is that it slips off the roll pin and actualy makes a larger hole in the stock then you need or even want .. I have one sitting here I did and it fits my LMT buffer tubes very nice.... also wanted to add.. JB weld 4 minute quick set epoxy drys dark grey almost black and if done carefully can be used to fill the pin holes in the stock once its removed..... Viper |
+1 |
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How do you get the nut (the one that goes on the extension tube threads) off w/o marring anything? The last time I assembled an AR, that nut/ring was slightly different; it had a hole in it which allowed me to use the standard, cheap spanner thing. Also, it's staked (typical for Colt, but I've never dealt with that) - will that be a problem? My MT6400 is NIB, absolutely pristine, and I don't want to scratch anyting. Hate to be anal about this, but I want it to look untampered with, professional, etc. |
Specialized Armament also carries the parts. I'm going to do the work next week on the stock and I'll report back. |
All I need to do is get it un-staked and I am good to go! HELP!
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clubster, I'm in the same boat about how to get that staked nut off. I found this thread: www.ar15.com/forums/topic.html?b=3&f=4&t=207650 Looks like we've got some drilling/dremelling to do! |
Fro: Were you able to use the sliding buttstock lock pin nut off the MT6400C stock, or did you have to use the one off your extra stock?  I'm referring to part number 11 in the diagram. As I understand it, the only parts one need buy are 7 and 8. Parts 9, 10, 11, and 12 from the MT6400C stock are still usable. Am I right? |
My parts came from the extra stock I had. There is none of the lever pin parts on the fixed stock. They just put an allen headed screw through the non movable lever that fastens into the buffer tube. When you remove that, the lever is useable. Here is what it looks like with the stock portion removed. That screw is what holds it together and is useless when removed. ( well its in the parts box for a possible future use  ) Great diagram. You will need 7,8,11,& 12. I think I know of another place to get the parts. Let me check and I'll add it onto this thread if I can find it. |
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Look HERE IN ADCO FORUMS for a lead on the parts. I gotta get off the computer for the night. Probably get the buffer tube and the lever parts all at one place 
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Yeah, great diagram, El_Abogado, and thanks for all your time, FRO, having already done this. We'll also need a new 3 and possibly 2 after drilling the stakes out, probably ruining 3 and scarring 2. See the thread I referred to a few posts back about getting the castle nut off. FRO, what did you do to remove part 3 (castle nut)? |
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ADCO has the lever parts for 9.00 and I believe the VLTOR buffer tubes are 42.00 and are avalible through them as well. Kind of a "one stop shop". i've had work done by them and would recommend them. I looked on the SAW website and they are selling VLTOR stocks. SAW might think the VLTOR buffer tube is as good as the Colt buffer tube also. cb7, The link and advise is good but might be a little excessive. I did not have to destroy my parts to get them off. Every rifle is different, but all they do is tourque the castle nut on, and hit it with a punch at the notches to "stake it on". They just want to deform the metal together so they will not slide against each other and loosen. I just took a dremel with a bit (I'll have to look when I get home to tell you which one. It was a small thin cutter wheel) and smoothed the metal where it was punched taking off very little. Then I removed th castle nut with a wrench. I then touched it up when I put it back on. You cant really tell it had been removed. I'll try to post some pics refering to what I'm talking about but it will probably be Friday before I can. PS If anybody is replacing the standard A2 grip on your 6400C with a hogue or some other after market pistol grip. I'm looking for a Colt one for another rifle. Please keep me in mind if you dont want it. |
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