My response from Magpul regarding the UBR on the M&P 10.
Thank you for your inquiry. The UBR will work with AR10-type guns with the addition of a custom short carbine buffer. The issue lies in the fact that the UBRīs included (and required) Entry-Length Carbine Receiver Extension is the proper length for AR15s using the 5.56x45 cartridge while the larger 7.62x51 requires a longer bolt carrier. Since a longer receiver extension tube cannot be used with the UBR to accommodate the longer 7.62x51 carrier a shorter buffer must therefore be used. Some platforms such as the DPMS LR-308 already use a shorter buffer (with a standard length tube) and should be good to go. Others, such as the Armalite AR10, use a longer tube (with a standard length buffer) and a replacement buffer is necessary.
As long as the buffer measures about 2.5 inches in length you should be good to go.
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