Rey,
It'll work in a pinch, but sustained firing may cause permanent damage to your endcap.
You may want to contact Buffer Technology (P.O. Box 104903, Jefferson City, MO, 65110 USA, http://www.buffertech.com) and see if they can help you. They make a buffer for the HK91 and it should fit into your MP5 (the shape of the receiver on all those guns are the same). Drop them an email and see if they can help. Good luck.
Gary
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