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For: Madbull ACE Licensed LiPo Battery Buffer Tube For M4 AEGProduct Information:
It is a very nice tube, but it did not fin my HK E1 stock, even though I was told it is milspec. With modification (hours sanding the stock and grinding the tube), I was able to make it fit my HK416c, and it looks perfect, so in the end it was worth it.
Great for buffer tube batteries
Finnish is exquisite
Did not fit the HK E1 stock without modification