Hi all! I have a Bushmaster Post Ban M4 that I'd like to shorten and possibly replace with Magpul MOE. Are the only thing I need to shop for are MOE stock and receiver extension? What about buffer spring? I don't know if you need a shorter spring b/c of the shorter receiver extension. I'm pretty sure buffer assembly, collar, ext nut, etc.. can be reused (correct me if I'm wrong.) Seems easier to buy a complete kit but impractical cost wise since I still want a different stock and will end up with a lot of extra parts.

 

Will be brought to a gunsmith of course for compliant assembly.

 

Thanks!

Do you have a buffer tube right now? Is it mil-spec or civilian? You can buy just the MOE stock and have it pinned.

Its commercial or civilian spec from what I researched.

The receiver extension is long so after unpinning the stock the tube protrudes past the stock if you slide it more than 2 inches.

 

http://www.ar15.com/mobile/topic.html?b=12&f=2&t=76

Lower Receiver and Buttstock Assembly 3/3 down the page

 

 

Do you have a buffer tube right now? Is it mil-spec or civilian? You can buy just the MOE stock and have it pinned.

Its commercial or civilian spec from what I researched.

The receiver extension is long so after unpinning the stock the tube protrudes past the stock if you slide it more than 2 inches.

 

http://www.ar15.com/mobile/topic.html?b=12&f=2&t=76

Lower Receiver and Buttstock Assembly 3/3 down the page

 

Ok then so i have it right, the current stock is a Standard, FIXED, A-2 style, correct?

 

if that is the case, then you will need to get a Reciever Extension designed for a CAR-style stock. Magpul akes both Civi and Mil standard sizes, so it doesnt make a difference as long as you reember to order the correct reciever extension. You will also need a carbine Spring and Buffer, as they are different than the Fixed-Stock version.

Actually its Post-ban M4 carbine but fixed stock. Collapsible looking but permanently pinned. I can't find a diagram online so I used this instead. Looks like I'll end up getting a complete kit for simplicity.

PSA has a nice kit that contains everything you need except the stock. Here for the milspec one (they have commercial also). Then just pick out your m4 style stock of choice , of course paying attention to choose milspec or commercial depending on the tube you go with.

 

IMO, you shouldn't have to take it to a smith. You can have the stock parts shipped to someone else's house that does not posses a AR lower and pin it there away from the rest of your AR parts. Then you can bring it home and mate it up with your lower.

You have this thing right?

 

 

If so, it will contain a rifle buffer and spring.

Thanks! Good call. I'll remember that. I thought it's ok to have them as rebuild pieces or parts as long as they are not put together. But better not leave room for questioning.

 

You can have the stock parts shipped to someone else's house that does not posses a AR lower and pin it there away from the rest of your AR parts. Then you can bring it home and mate it up with your lower.

Thanks! Good call. I'll remember that. I thought it's ok to have them as rebuild pieces or parts as long as they are not put together. But better not leave room for questioning.

 

 

 

Yup, if you have the pieces all in the same place... it is considered "constructive possession", which is the same as having it all assembled.

I have a bushy just like this, I did the MOE stock on it just like yopu want. you will need to get a new buffer tube and I suggest that you go on www.Bravocompanyusa.com, order the COMPLETE tube with the H buffer and spring. Order your MOE from them too (they have a great price)

go to tractor supply, buy a 1/8" drill bit and a few 1/8' x 3/4 roll pins. install the tube and size it out, drill the tube and smack the roll pin in...done. takes like 1/2 hour start to finish. I used 2 pins in my set up. I did it because the wife shoots this and the stock was way too long for her.

Great info! I'm set then. Thanks all!!!!