AR Sponsor
Posted: 11/17/2009 11:45:41 AM EDT
|
can i use either a mil spec or commercial buffer tube for my lower build? its a s&w m&p receiver.
in other words, is the design (mil spec or commercial) dependent upon the lower receiver i am using, or simply the stock i plan to use? thanks. |
|
The lower is always threaded the same and uses either extension/buffer tube. Without getting into the technical differences, the mil spec extension is a little smaller in diameter than the commercial, but at the threads they are the same for purposes of your question. All the other parts are the same also (buffer, spring, castle nut and receiver end plate). You will want to order a stock based on the size of the extension you put on. Typically, if doing in a build the mil spec is recommended. It is said to be stronger and there are more stock options in that size.
ETA: Didn't mean to repeat the same stuff, he posted while I was typing. If you buy a kit it will usually come with a regular buffer. Try it, if you want to go to a heavier buffer later they are not expensive. You can put too heavy of a buffer in and cause malfunctions. With the Tac Sol (which I am waiting on delivery, also - hopefully today) you won't need a buffer or spring at all. You can leave it in though so you don't forget to put it back in when you switch the lower to a .223/5.56 upper. (Yip, I've done it - you realize it before you shoot which is good, but they are a pain to get the bolt un stuck). |
AR Sponsor