I coupled this with a Ruger lower with all standard mil-spec parts and a Midwest Industries hand guard. It has been absolutely flawless! Most X39 manufacturers are back ordered into oblivion and among those that had products in stock, I was having trouble finding exactly what I wanted. I contacted MAS Defense and explained what I was looking for and then created this barreled upper option and added it to their website just for me in about ten minutes. It was assembled, test fired, and on my porch in about seven ds. Cannot say enough about the quality of product and especially the service of the company. I've been telling everyone about this companywould buy again from them in a heartbeat!
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