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Continue to ChatAero Precision M4E1 Threaded Upper Mid-Length 14.5" - 5.56MM NATO https://www.deltamike.co.nz/product/aero-precision-m4e1-threaded-upper-mid-length-14-5-5-56mm-nato/
Aero Precision M4E1 Threaded Upper Mid-Length 14.5" - 5.56MM NATO https://www.deltamike.co.nz/product/aero-precision-m4e1-threaded-upper-mid-length-14-5-5-56mm-nato/