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upper receiver groups

WHEN FITTING A GEN-12 UPPER RECEIVER GROUP TO A LOWER, WE CAN ONLY GUARANTEE PROPER FITMENT AND FUNCTION WITH OUR LOWER RECEIVER. OTHER DPMS GEN 1 PATTERNED LOWER RECEIVERS WILL MATE TO THE GEN-12 UPPER, BUT MAGAZINE FITMENT AND PROPER FUNCTION CANNOT BE GUARANTEED. 

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