stock change for AR

obrown23

January 19, 2014 12:06

I have a new S&W MP 15 sport. I would like to change the adjustable carbine stock to an A2 fixed stock. How big a deal is this?. I know I have to change the buffer tube, buffer and spring, but do I need any special tools?

Thanks

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  dcs shooters

  January 19, 2014 12:35

  You need a stock wrench for both buffer tubes, like this one [;)]
  
  http://www.GunBroker.com/Auction/ViewItem.aspx?Item=386643250

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  Laredo Lefty

  January 19, 2014 12:36

  This shows a stock remove and install, adjustable to adjustable, but it shows the things you will need to get it done. You'll need a castlenut wrench. Also watch out for the detent spring for the rear takedown pin when you remove the stock. You may want to stake the castlenut but it's not required as long as you snug it well.
  
  
  http://www.youtube.com/watch?feature=player_detailpage&v=jmJB990mZAc

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  tsr1965

  January 19, 2014 12:38

  You will need a spanner wrench, and a Dremel with a cut off disc(Dremel to remove the stake) to remove the castle nut on the collapsible stock. If you do not intend to keep the castle nut, you can get away with Channel Locks, if you are careful.
  
  Best

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  mark christian

  January 19, 2014 12:39

  At the rear of the receiver there will be a plate and a lock ring which secures it. On some ARs the ring is notched and very easy to reme with the use of a special spanner, which costs about five bucks.
  
  On some rifles, like this Olympic Arms, the ring is not notched
  
  
  Some Colt rifles have their rings tack welded to the rear plate and that also complicates removal:
  

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  obrown23

  January 20, 2014 03:33

  Thanks for all the help.

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  Txs

  January 20, 2014 04:53

  You should be able to remove a staked nut by just twisting the wrench, though it could possibly require an extension slid over it's handle. During use this nut isn't under a lot of stress and with proper staking a great amount of metal doesn't have to be moved to prevent it from vibrating loose.
  
  If you find a nut especially difficult with a wrench, rather than immediately resorting to a Dremel just use a punch to push the staked material back a bit.
  
  Also consider that some manufacturers use only loctite, others only stake the nut, while some stake and loctite. If that's the case some thread cleanup is going to be required before reassembly.
  
  Throughout this process keep in mind that the idea behind staking rather than loctiting or tack welding ([:0]) an M16/AR receiver extension nut in place is that the rifle can be disassembled in the field using only the tools contained in it's armorer kit. It's designed to be taken down with just the wrench and possibly a slight massage with a punch.

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  Mobuck

  January 20, 2014 08:43

  Keep in mind you CAN break the lower if you're using a magwell block as the only support when applying too much torque.

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