M&P 10 - PRS gen1 Stock Delete

[Bigsawer]

I came across this rifle that the owner couldn't lock the bolt back with the charging handle and otherwise ran poorly.

With the cheek riser up even a bit, the charging handle would be stopped from traveling rearward enough to lock.

Further inspection revealed the bolt was hitting the receiver due to a carbine length buffer. A rifle length buffer fixed that & runs better. (gee, ya think?) So, someone slapped on an expensive stock & called it a day, never checking their results.

I know a lot on these are proprietary & I've only fooled with ar-15 mil-spec sized stuff. Do they take milspec tubes and buffers so I can simply rebuild the back end with a stock I want? Trying to chase a correct answer all over the web is giving me a big headache.

 

[Rocinante]

EDIT: I misunderstood that the core problem was directly from the PRS cheek riser. This was a common problem on the older PRS stocks as they were made specifically for AR15s- the current Gen-3 PRS's riser clears the charging handle on both AR10s and AR15s.

M&P-10 is a stock DPMS pattern- the user's likely problem was he was using an AR-15 carbine buffer. AR-10s/LR-308s, because of their longer bolt carriers while using the same buffer tubes as AR15s, need shorter buffers- aka "AR10/.308" buffers.
Your picture shows a standard AR10 rifle buffer.

 

[Bigsawer]

I want to eliminate the existing stock as the cheek riser can't be used. I may have to swap out the extension tube, so I'm wondering if milspec tubes can be used.

 

[Rocinante]

Yes, AR10s/LR-308s use standard AR-15 buffer tubes. Just make sure you use a .308-length buffer.

 

[Bigsawer]

The rifle length like in the picture? Numrich has factory stocks and both stock and buffers look like short carbine ones.

 

[Rocinante]

If you want a carbine stock, use a carbine buffer tube, castle nut, endplate and a .308 carbine buffer.
If you want a rifle stock, use a rifle buffer tube and a .308 rifle buffer.
The stocks and buffer tubes are the same for AR10s and AR15s, the buffers are not.

 

[Bigsawer]

You've explained it so simply. Thats something i couldn't find elsewhere. That's info I needed. Thanks

 

[Bigsawer]

Sorry, one more question. What about the buffer spring? 308 specific?