An awesome gun doc from here was working on my king arms m4 while i observed and it was a tight fit as well. Easy to open .... Tough to close. Rubber mallet with a gentle touch will guide it in. Watch the hop up cover, as mine liked to slide out of place while seating everything in its final place. Some feathering of the bolt catch while you work the mating of upper and lower reciever should help out.
I'm thinking this latest batch from king arms are tight fits all around.
Last edited by jamex; April 21st, 2012 at 21:05..
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