Hey guys - I have 3 upper receivers LMT, BCM and Spikes. I noticed that on the upper receiver pivot pin notch there is a difference. The LMT is just a straight square block (when looking from front or back), the BCM and Spikes have the side of the notch beveled on each side. I think this is the culprit for the slight loose fit between the upper and lower.
Does anyone know what other manufacturer has a square block like LMT's? LMT doesn't sell the upper receiver stripped so I need to find a different manufacturer. Thanks!


Reply With Quote

Bookmarks