MidwestPX 172 Posted March 24, 2014 Due to design issues with the non-reciprocating charging handle, the sidecharge uppers I was planning on stocking are shelved for now. This is because the majority of the rails I sell have anti-rotation tabs which make them incompatible with the receiver. The Cross Hill side charge uppers I currently stock work without issue. Quote Share this post Link to post Share on other sites