LR308 buffer tube

[ILVSMOG]

From what I've read, the LR308 receivers have a different buffer tube thread as compared to the .223 receivers. I've been hunting around, but can't find a LR308 rifle length buffer tube anywhere, only "kits" with more parts than I need. I tried Armalite's website, but they list the AR-15 and AR-10 as using the same part number rifle length buffer tube, which confused me even more.

Can anyone shed some light on why my spare .223 rifle-length buffer tube won't thread in to my TM 308 lower and where the heck I find the correct tube without all the extra parts I already have? This dang tube is literally ALL that's stopping my build from going together.

THANK YOU!!!

[baih777]

you better look closer at the threads. i just finished a TM 10 and i used a spikes carbine buffer tube. the tubes are suppose to be the same. 223 and 308. its the springs and buffers that are different.

[ott1]

From what I've read, the LR308 receivers have a different buffer tube thread as compared to the .223 receivers. I've been hunting around, but can't find a LR308 rifle length buffer tube anywhere, only "kits" with more parts than I need. I tried Armalite's website, but they list the AR-15 and AR-10 as using the same part number rifle length buffer tube, which confused me even more.

Can anyone shed some light on why my spare .223 rifle-length buffer tube won't thread in to my TM 308 lower and where the heck I find the correct tube without all the extra parts I already have? This dang tube is literally ALL that's stopping my build from going together.

THANK YOU!!!

Probably a worned tap was used in the machining. Use a 1-3/16"-16 tap to chase the threads. Borrow or take it to someone with the tap.

http://www.midwayusa.com/product/799763/ar-stoner-receiver-extension-buffer-tube-tap-1-3-16-16-thread-ar-15

[Ub3rD0rk]

You probably have buggered up threads or a tube for something other than an AR15. I have an LR308 with a standard A2 receiver extension tube for mounting the PRS stock. I just checked my spikes tactical 6 position tube and it went right in.

[ott1]

The OP's problem is not unique. I've had at least 2 TM lowers with threads that didn't allow the extension to thread in without exerting a lot of force. Just chase the thread with the tap and you'll be good to go.

[kcstott]

The thing is I don't think he ever tried a regular tube at all.

From what I've read, the LR308 receivers have a different buffer tube thread as compared to the .223 receivers.

Try a standard tube and see if it fits. I have a tap if you need it.

[ILVSMOG]

Thanks for the sanity-check, guys. I checked the buffer tube in another lower to make sure that wasn't the prOblem and it went in by hand, no problem. I cleaned the threads on the problem-lower as best I could with a pick and wire brush. I added a touch of anti-seize. Put it in the vise and held my breath. It's in now and everything looks fine. It was just WAY tougher than I'm used to with these things.

Thanks again!!