Hawkins DBM / MDT Mag Fitment

Not sure if the Long action is the same as the Short, but you may need to shorten your mag latch to get them to go.

If you hold the mag in, does everything feed well?

If so, Use some dry erase marker on the mag's catch then put it in. Take it out and see how much you need to take off the latch.

The above is the correct answer, but you should check with Hawkins to see if they offer a shorter mag catch release. MDT and KRG both sent me the part I needed just for asking. Both were short actions. I too don't know if the same applies to long actions.